Pararobertsite (original) (raw)
A valid IMA mineral species
About PararobertsiteHide
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Formula:
Ca2Mn3+3(PO4)3O2 · 3H2O
Colour:
Bronze, cinnamon brown, yellow, dark red
Lustre:
Sub-Vitreous, Resinous, Waxy, Greasy
Crystal System:
Monoclinic
Name:
Named in 1988 by Andrew C. Roberts, B. Darko Sturman, Pete J. Dunn, and Willard L. Roberts, from the Greek 'para' for near, and robertsite, for the polymorphic relationship with that mineral.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:3108:6
2335f57d-e6ba-471d-b80e-3527d1e8bc53
IMA Classification of PararobertsiteHide
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Type description reference:
Roberts, A. C., Sturman, B. D., Dunn, P. J., Roberts, W. L. (1989) Pararobertsite, Ca2Mn3+3(PO4)3O2·3H2O, a New Mineral Species from the Tip Top Pegmatite, Custer County, South Dakota, and its Relationship to Robertsite. The Canadian Mineralogist, 27 (3) 451-455
Classification of PararobertsiteHide
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8.DH.30
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1
42.8.5.2
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : (AB)5(XO4)3Zq·xH2O
19.12.7
19 : Phosphates
12 : Phosphates of Mn
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Prb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of PararobertsiteHide
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Sub-Vitreous, Resinous, Waxy, Greasy
Transparency:
Transparent, Translucent
Colour:
Bronze, cinnamon brown, yellow, dark red
Comment:
Usually dark red to cinnamon brown
Fracture:
Irregular/Uneven
Density:
3.22 g/cm3 (Measured) 3.21 g/cm3 (Calculated)
Optical Data of PararobertsiteHide
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RI values:
_n_α = 1.791(1) _n_β = 1.811(1) _n_γ = 1.831(1)
2V:
Measured: 84° , Calculated: 85° to 88°
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Optical Extinction:
Z^c = 4°
Comments:
X = yellowish brown; Y = Z = reddish brown
Comments:
Absorption: Z = Y > X
Chemistry of PararobertsiteHide
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Mindat Formula:
Ca2Mn3+3(PO4)3O2 · 3H2O
Crystallography of PararobertsiteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.825(3) Å, b = 13.258(4) Å, c = 11.087(3) Å
β = 101.19(4)°
Ratio:
a:b:c = 0.666 : 1 : 0.836
Morphology:
Triangular to pseudo-rhombohedral plates, sometimes rhombic plates.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0002513 | Pararobertsite | Kampf A R (2000) The crystal structure of pararobertsite and its relationship to mitridatite American Mineralogist 85 1302-1306 |  |
2000 | Tip Top pegmatite, Custer County, South Dakota, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.69 Å | (100) |
| 5.66 Å | (60) |
| 5.44 Å | (50) |
| 2.884 Å | (60) |
| 2.772 Å | (70) |
| 2.611 Å | (60) |
| 2.163 Å | (60) |
Geological EnvironmentHide
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Geological Setting:
Fracture fillings in late-stage mineralization in a phosphate-rich granite pegmatite.
Type Occurrence of PararobertsiteHide
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General Appearance of Type Material:
Thin red transparent single plates, or clusters of plates, on whitlockite.
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Canada, M43771.
National Museum of Natural History, Washington, D.C., USA, 149606.
Geological Setting of Type Material:
In secondary seams ina complex, zoned pegmatite.
Associated Minerals at Type Locality:
Reference:
Roberts, Andrew C., Sturman, B. Darko, Dunn, P. J., and Roberts, Willard, L. (1989) Pararobertsite, Ca
2
Mn3+
3
(PO
4
)
3
)
2
.3H
2
), a New Mineral Species from the Tip Top Pegmatite, Custer County, South Dakota, and its Relationship to Robertsite. Canadian Mineralogist: 27: 451-455.
Synonyms of PararobertsiteHide
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Other Language Names for PararobertsiteHide
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Relationship of Pararobertsite to other SpeciesHide
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Structurally related to group(s):
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 8.DH. | Ferroberaunite | Fe2+Fe3+5(PO4)4(OH)5 · 6H2O | Mon. 2/m : _B_2/b |
|---|---|---|---|
| 8.DH. | Rowleyite | [Na(NH4,K)9Cl4][V5+,4+2(P,As)O8]6 · n[H2O,Na,NH4,K,Cl] | Iso. |
| 8.DH. | Ammoniotinsleyite | (NH4)Al2(PO4)2(OH) · 2H2O | Mon. 2/m : _P_21/m |
| 8.DH. | Thebaite-(NH4) | (NH4)3Al(C2O4)(PO3OH)2(H2O) | Mon. 2/m : _P_21/b |
| 8.DH. | Dendoraite-(NH4) | (NH4)2NaAl(C2O4)(PO3OH)2(H2O)2 | Mon. 2/m |
| 8.DH. | Whiteite-(MnMnMn) | Mn2+Mn2+Mn2+2Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH. | Whiteite-(CaMnFe) | CaMnFe2Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m |
| 8.DH. | Hochleitnerite | Mn2Ti3(PO4)4O2(H2O)2 · 14H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH. | Regerite | KFe6(PO4)4(OH)7(H2O)6 · 4H2O | Mon. 2/m : _P_21/b |
| 8.DH.05 | Minyulite | KAl2(PO4)2F · 4H2O | Orth. m _m_2 : P b _a_2 |
| 8.DH.10 | Leucophosphite | KFe3+2(PO4)2(OH) · 2H2O | Mon. 2/m : _P_21/b |
| 8.DH.10 | Spheniscidite | (NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O | Mon. 2/m |
| 8.DH.10 | Tinsleyite | KAl2(PO4)2(OH) · 2H2O | Mon. |
| 8.DH.15 | Jahnsite-(CaMnFe) | {Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(CaMnMg) | {Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(CaMnMn) | {Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Keckite | CaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Rittmannite | {(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Whiteite-(CaFeMg) | {Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_21/b |
| 8.DH.15 | Whiteite-(CaMnMg) | {Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m |
| 8.DH.15 | Whiteite-(MnFeMg) | {(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_21/b |
| 8.DH.15 | Jahnsite-(MnMnMn) | {Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_21/b |
| 8.DH.15 | Kaluginite | (Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2O | Orth. |
| 8.DH.15 | Jahnsite-(CaFeFe) | {Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. |
| 8.DH.15 | Jahnsite-(NaFeMg) | NaFe3+Mg2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(NaMnMg) | {(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(CaMgMg) | {Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O | |
| 8.DH.15 | Whiteite-(CaMnMn) | {Ca}{Mn2+}{Mn2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Whiteite-(MnMnMg) | MnMnMg2Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(MnMnMg) | Mn2+Mn2+Mg2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(CaFeMg) | CaFe2+Mg2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(MnMnFe) | Mn2+Mn2+Fe2+2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Whiteite-(CaMgMg) | CaMg3Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(MnMnZn) | Mn2+Mn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(NaMnMn) | NaMn2+(Mn2+Fe3+)Σ2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(CaMnZn) | CaMn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.20 | Lun'okite | (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.20 | Manganosegelerite | (Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.20 | Overite | CaMgAl(PO4)2(OH) · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.20 | Segelerite | Ca2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P c c a |
| 8.DH.20 | Wilhelmvierlingite | CaMnFe3+(PO4)2(OH) · 2H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.20 | Juonniite | CaMgSc(PO4)2(OH) · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.25 | Calcioferrite | Ca2Fe3+2(PO4)3(OH) · 7H2O | Mon. 2/m : _B_2/b |
| 8.DH.25 | Kingsmountite | Ca3MnFeAl4(PO4)6(OH)4 · 12H2O | Tric. 1 : _P_1 |
| 8.DH.25 | Montgomeryite | Ca4MgAl4(PO4)6(OH)4 · 12H2O | Mon. 2 : _B_2 |
| 8.DH.25 | Zodacite | Ca4Mn2+Fe3+4(PO4)6(OH)4 · 12H2O | Mon. |
| 8.DH.25 | Fanfaniite | Ca4MnAl4(PO4)6(OH)4 · 12H2O | Mon. 2/m : _B_2/b |
| 8.DH.30 | Arseniosiderite | Ca2Fe3+3(AsO4)3O2 · 3H2O | Mon. 2/m : _B_2/b |
| 8.DH.30 | Kolfanite | Ca2Fe3+3O2(AsO4)3 · 2H2O | Mon. |
| 8.DH.30 | Mitridatite | Ca2Fe3+3(PO4)3O2 · 3H2O | Mon. 2/m : _B_2/b |
| 8.DH.30 | Robertsite | Ca2Mn3+3(PO4)3O2 · 3H2O | Mon. m : B b |
| 8.DH.30 | Sailaufite | (Ca,Na,◻)2Mn3+3(AsO4)2(CO3)O2 · 3H2O | Mon. m : B m |
| 8.DH.35 | Mantienneite | KMg2Al2Ti(PO4)4(OH)3 · 15H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.35 | Paulkerrite | K(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O | Mon. m |
| 8.DH.35 | Benyacarite | (H2O)2Mn2Ti2Fe3+(PO4)4(OF)(H2O)10 · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.35 | Hydroxylbenyacarite | (H2O)2Mn2(Ti2Fe)(PO4)4[O(OH)](H2O)10 · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.35 | Macraeite | K(H2O)Mn2(Fe2Ti)(PO4)4[O(OH)](H2O)10 · 4H2O | Mon. 2/m : _P_21/b |
| 8.DH.35 | Sperlingite | (H2O)K(Mn2+Fe3+)(Al2Ti)(PO4)4[O(OH)] [(H2O)9(OH)] · 4H2O | Mon. 2/m : _P_21/b |
| 8.DH.40 | Xanthoxenite | Ca4Fe3+2(PO4)4(OH)2 · 3H2O | Tric. 1 : _P_1 |
| 8.DH.45 | Mahnertite | NaCu3(AsO4)2Cl · 5H2O | Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_4/m m m |
| 8.DH.50 | Andyrobertsite | KCdCu5(AsO4)4(H2AsO4) · 2H2O | Mon. 2/m : _P_21/m |
| 8.DH.50 | Calcioandyrobertsite | KCaCu5(AsO4)4(H2AsO4) · 2H2O | Mon. 2/m : _P_21/m |
| 8.DH.55 | Englishite | K3Na2Ca10Al15(PO4)21(OH)7 · 26H2O | Mon. 2/m |
| 8.DH.60 | Bouazzerite | Bi6(Mg,Co)11Fe3+14(AsO4)18(OH)4O12 · 86H2O | Mon. 2/m |
| 8.DH.65 | Galliskiite | Ca4Al2(PO4)2F8 · 5H2O | Tric. 1 : _P_1 |
| 8.DH.70 | Joteite | Ca2CuAl(AsO4)[AsO3(OH)]2(OH)2 · 5H2O | Tric. 1 : _P_1 |
| 8.DH.75 | Kampelite | Ba6Mg3Sc8(PO4)12(OH)6 · 7H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 8.DH.80 | Kapundaite | NaCaFe4(PO4)4(OH)3 · 5H2O | Tric. 1 : _P_1 |
| 8.DH.85 | Vaniniite | Ca2Mn2+3Mn3+2O2(AsO4)4 · 2H2O | Mon. 2/m : _P_21/b |
Fluorescence of PararobertsiteHide
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Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for PararobertsiteHide
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References for PararobertsiteHide
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Reference List:
Roberts, A. C., Sturman, B. D., Dunn, P. J., Roberts, W. L. (1989) Pararobertsite, Ca2Mn3+3(PO4)3O2·3H2O, a New Mineral Species from the Tip Top Pegmatite, Custer County, South Dakota, and its Relationship to Robertsite. The Canadian Mineralogist, 27 (3) 451-455
Localities for PararobertsiteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
| Poland | |
|---|---|
| Lower Silesian Voivodeship Dzierżoniów County Piława Górna DSS Piława Górna Quarry ⓘ Julianna pegmatite ? | Pieczka et al. (2015) +1 other reference |
| Ząbkowice Śląskie County Gmina Ząbkowice Śląskie Szklary ⓘ Mt. Szklana Mine (Szklary pegmatite) ? | Pieczka et al. (2015) +1 other reference |
| USA (TL) | |
| South Dakota Custer County Custer Mining District Fourmile ⓘ Tip Top Mine (TL) | Roberts et al. (1989) +1 other reference |