Loma Peguera deposit, Falcondo Mines, Bonao, Monseñor Nouel Province, Dominican Republic (original) (raw)

ⓘ Awaruite

Formula: Ni3Fe

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

Aiglsperger, Thomas, Proenza, Joaquin A., Zaccarini, Federica, Lewis, John F., Garuti, Giorgio, Labrador, Manuel, Longo, Francisco (2015) Platinum group minerals (PGM) in the Falcondo Ni-laterite deposit, Loma Caribe peridotite (Dominican Republic) Mineralium Deposita, 50 (1) 105-123 doi:10.1007/s00126-014-0520-9

ⓘ Bowieite

Formula: Rh2S3

References:

Aiglsperger, Thomas, Proenza, Joaquin A., Zaccarini, Federica, Lewis, John F., Garuti, Giorgio, Labrador, Manuel, Longo, Francisco (2015) Platinum group minerals (PGM) in the Falcondo Ni-laterite deposit, Loma Caribe peridotite (Dominican Republic) Mineralium Deposita, 50 (1) 105-123 doi:10.1007/s00126-014-0520-9

ⓘ Brucite

Formula: Mg(OH)2

References:

Marchesi, Claudio, Garrido, Carlos J., Proenza, Joaquín A., Hidas, Károly, Varas-Reus, María Isabel, Butjosa, Lidia, Lewis, John F. (2016) Geochemical record of subduction initiation in the sub-arc mantle: Insights from the Loma Caribe peridotite (Dominican Republic) Lithos, 252. 1-15 doi:10.1016/j.lithos.2016.02.009

ⓘ 'Chlorite Group'

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

ⓘ Chromite

Formula: Fe2+Cr3+2O4

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

Aiglsperger, Thomas, Proenza, Joaquin A., Zaccarini, Federica, Lewis, John F., Garuti, Giorgio, Labrador, Manuel, Longo, Francisco (2015) Platinum group minerals (PGM) in the Falcondo Ni-laterite deposit, Loma Caribe peridotite (Dominican Republic) Mineralium Deposita, 50 (1) 105-123 doi:10.1007/s00126-014-0520-9

ⓘ Chrysotile

Formula: Mg3(Si2O5)(OH)4

References:

Marchesi, Claudio, Garrido, Carlos J., Proenza, Joaquín A., Hidas, Károly, Varas-Reus, María Isabel, Butjosa, Lidia, Lewis, John F. (2016) Geochemical record of subduction initiation in the sub-arc mantle: Insights from the Loma Caribe peridotite (Dominican Republic) Lithos, 252. 1-15 doi:10.1016/j.lithos.2016.02.009

ⓘ Falcondoite (TL)

Formula: (Ni,Mg)4Si6O15(OH)2 · 6H2O

Type Locality:

ⓘ 'Fayalite-Forsterite Series'

References:

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

ⓘ Ferronickelplatinum

Formula: Pt2FeNi

ⓘ 'Garnierite'

ⓘ Garutiite (TL)

Formula: (Ni,Fe,Ir)

Type Locality:

References:

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

ⓘ Goethite

Formula: α-Fe3+O(OH)

References:

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

ⓘ Hexaferrum

Formula: (Fe,Os,Ru,Ir)

References:

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

ⓘ Irarsite

Formula: (Ir,Ru,Rh,Pt)AsS

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

ⓘ Laurite

Formula: RuS2

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

Aiglsperger, Thomas, Proenza, Joaquin A., Zaccarini, Federica, Lewis, John F., Garuti, Giorgio, Labrador, Manuel, Longo, Francisco (2015) Platinum group minerals (PGM) in the Falcondo Ni-laterite deposit, Loma Caribe peridotite (Dominican Republic) Mineralium Deposita, 50 (1) 105-123 doi:10.1007/s00126-014-0520-9

ⓘ 'Limonite'

References:

Aiglsperger, Thomas, Proenza, Joaquin A., Zaccarini, Federica, Lewis, John F., Garuti, Giorgio, Labrador, Manuel, Longo, Francisco (2015) Platinum group minerals (PGM) in the Falcondo Ni-laterite deposit, Loma Caribe peridotite (Dominican Republic) Mineralium Deposita, 50 (1) 105-123 doi:10.1007/s00126-014-0520-9

ⓘ Lizardite

Formula: Mg3(Si2O5)(OH)4

References:

Marchesi, Claudio, Garrido, Carlos J., Proenza, Joaquín A., Hidas, Károly, Varas-Reus, María Isabel, Butjosa, Lidia, Lewis, John F. (2016) Geochemical record of subduction initiation in the sub-arc mantle: Insights from the Loma Caribe peridotite (Dominican Republic) Lithos, 252. 1-15 doi:10.1016/j.lithos.2016.02.009

ⓘ Magnetite

Formula: Fe2+Fe3+2O4

References:

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

Marchesi, Claudio, Garrido, Carlos J., Proenza, Joaquín A., Hidas, Károly, Varas-Reus, María Isabel, Butjosa, Lidia, Lewis, John F. (2016) Geochemical record of subduction initiation in the sub-arc mantle: Insights from the Loma Caribe peridotite (Dominican Republic) Lithos, 252. 1-15 doi:10.1016/j.lithos.2016.02.009

ⓘ Népouite

Formula: Ni3Si2O5(OH)4

ⓘ 'Nickelferroplatinum'

ⓘ Pecoraite

Formula: Ni3(Si2O5)(OH)4

ⓘ Pentlandite

Formula: (NixFey)Σ9S8

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

ⓘ Quartz

Formula: SiO2

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

ⓘ Ruthenium

Formula: (Ru,Ir)

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

ⓘ Sepiolite

Formula: Mg4(Si6O15)(OH)2 · 6H2O

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

ⓘ 'Serpentine Subgroup'

Formula: D3[Si2O5](OH)4

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

Mc Donald, Andrew M., Proenza, Joaquin A., Zaccarini, Federica, Rudashevsky, Nikolay S., Cabri, Louis J., Stanley, Chris J., Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J. (2010) Garutiite, (Ni,Fe,Ir), a new hexagonal polymorph of native Ni from Loma Peguera, Dominican Republic. European Journal of Mineralogy, 22 (2) 293-304 doi:10.1127/0935-1221/2010/0022-2007

ⓘ Spinel

Formula: MgAl2O4

References:

Marchesi, Claudio, Garrido, Carlos J., Proenza, Joaquín A., Hidas, Károly, Varas-Reus, María Isabel, Butjosa, Lidia, Lewis, John F. (2016) Geochemical record of subduction initiation in the sub-arc mantle: Insights from the Loma Caribe peridotite (Dominican Republic) Lithos, 252. 1-15 doi:10.1016/j.lithos.2016.02.009

ⓘ Talc

Formula: Mg3Si4O10(OH)2

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

Marchesi, Claudio, Garrido, Carlos J., Proenza, Joaquín A., Hidas, Károly, Varas-Reus, María Isabel, Butjosa, Lidia, Lewis, John F. (2016) Geochemical record of subduction initiation in the sub-arc mantle: Insights from the Loma Caribe peridotite (Dominican Republic) Lithos, 252. 1-15 doi:10.1016/j.lithos.2016.02.009

ⓘ Tetraferroplatinum

Formula: PtFe

ⓘ 'UM2007-11-E:FeIrNiOsRu'

Formula: (Ru,Ir,Os)3(Fe,Ni)2

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

ⓘ 'UM2007-12-E:FeIrNiOsRu'

Formula: (Ru,Ir,Os)(Fe,Ni)

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

ⓘ 'UM2007-13-E:FeIrNiOsRu'

Formula: (Ru,Ir,Os)3(Fe,Ni)

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

ⓘ 'UM2007-15-E:FeIrNiPt'

Formula: (Fe,Ni)2(Pt,Ir)

References:

Proenza, J. A., Zaccarini, F., Lewis, J. F., Longo, F., Garuti, G. (2007) Chromian spinel composition and the platinum-group minerals of the PGE-rich Loma Peguera chromitites, Loma Caribe peridotite, Dominican Republic. The Canadian Mineralogist, 45 (3) 631-648 doi:10.2113/gscanmin.45.3.631

ⓘ 'UM2009-06-E:FeIrNi'

References:

Zaccarini, Federica, Proenza, Joaquin A., Rudashevsky, Nikolay S., Cabri, Louis J., Garuti, Giorgio, Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J., Stanley, Chris J. (2009) The Loma Peguera ophiolitic chromitite (Central Dominican Republic): a source of new platinum group minerals (PGM) species. Neues Jahrbuch für Mineralogie - Abhandlungen, 185 (3) 335-349 doi:10.1127/0077-7757/2009/0127

ⓘ 'UM2009-07-E:FeIrNi'

Formula: Ir3(Ni,Fe)8

References:

Zaccarini, Federica, Proenza, Joaquin A., Rudashevsky, Nikolay S., Cabri, Louis J., Garuti, Giorgio, Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J., Stanley, Chris J. (2009) The Loma Peguera ophiolitic chromitite (Central Dominican Republic): a source of new platinum group minerals (PGM) species. Neues Jahrbuch für Mineralogie - Abhandlungen, 185 (3) 335-349 doi:10.1127/0077-7757/2009/0127

ⓘ 'UM2009-08-E:FeIrNi'

Formula: Ir3(Fe,Ni)4

References:

Zaccarini, Federica, Proenza, Joaquin A., Rudashevsky, Nikolay S., Cabri, Louis J., Garuti, Giorgio, Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J., Stanley, Chris J. (2009) The Loma Peguera ophiolitic chromitite (Central Dominican Republic): a source of new platinum group minerals (PGM) species. Neues Jahrbuch für Mineralogie - Abhandlungen, 185 (3) 335-349 doi:10.1127/0077-7757/2009/0127

ⓘ 'UM2009-09-E:FeIrNi'

Formula: Ir2(Fe,Ni)3

References:

Zaccarini, Federica, Proenza, Joaquin A., Rudashevsky, Nikolay S., Cabri, Louis J., Garuti, Giorgio, Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J., Stanley, Chris J. (2009) The Loma Peguera ophiolitic chromitite (Central Dominican Republic): a source of new platinum group minerals (PGM) species. Neues Jahrbuch für Mineralogie - Abhandlungen, 185 (3) 335-349 doi:10.1127/0077-7757/2009/0127

ⓘ 'UM2009-19-S:FeIrNiOsRu'

Formula: (Fe,Ru,Ni,Os,Ir)2S

References:

Zaccarini, Federica, Proenza, Joaquin A., Rudashevsky, Nikolay S., Cabri, Louis J., Garuti, Giorgio, Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J., Stanley, Chris J. (2009) The Loma Peguera ophiolitic chromitite (Central Dominican Republic): a source of new platinum group minerals (PGM) species. Neues Jahrbuch für Mineralogie - Abhandlungen, 185 (3) 335-349 doi:10.1127/0077-7757/2009/0127

ⓘ 'UM2009-20-S:FeIrNiOsRu'

Formula: (Ru,Fe,Ni,Os,Ir)2S

References:

Zaccarini, Federica, Proenza, Joaquin A., Rudashevsky, Nikolay S., Cabri, Louis J., Garuti, Giorgio, Rudashevsky, Vladimir N., Melgarejo, Joan C., Lewis, John F., Longo, Francisco, Bakker, Ronald J., Stanley, Chris J. (2009) The Loma Peguera ophiolitic chromitite (Central Dominican Republic): a source of new platinum group minerals (PGM) species. Neues Jahrbuch für Mineralogie - Abhandlungen, 185 (3) 335-349 doi:10.1127/0077-7757/2009/0127

ⓘ Willemseite

Formula: Ni3Si4O10(OH)2

ⓘ Zaccariniite (TL)

Formula: RhNiAs

Type Locality:

References:

Vymazalova, A., Laufek, F., Drabek, M., Stanley, C. J., Baker, R. J., Bermejo, R., Garuti, G., Thalhammer, O., Proenza, J. A., Longo, F. (2012) ZACCARINIITE, RhNiAs, A NEW PLATINUM-GROUP MINERAL FROM LOMA PEGUERA, DOMINICAN REPUBLIC. The Canadian Mineralogist, 50 (5) 1321-1329 doi:10.3749/canmin.50.5.1321