Harkerite Mineral Data (original) (raw)
General Harkerite Information
Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10•2(H2O)
Molecular Weight = 2,935.91 gm
Calcium 32.76 % Ca 45.84 % CaO
Magnesium 6.62 % Mg 10.98 % MgO
Aluminum 1.84 % Al 3.47 % Al2O3
Silicon 7.65 % Si 16.37 % SiO2
Boron 2.21 % B 7.11 % B2O3
Hydrogen 0.14 % H 1.23 % H2O
Carbon 4.09 % C 14.99 % CO2
Oxygen 44.69 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10•2(H2O)
Skarns in dolomitic limestones at the contact with granite
Valid Species (Pre-IMA) 1948
Camas Malag, near Broadford, Isle of Skye, Scotland. Link to MinDat.org Location Data.
Named for Alfred Harker (1859-1939), British petrologist, Cambridge University, Cambridge, England.
ICSD 12105
PDF 10-465
Harkerite Image
Harkerite Comments: B&W PPL image of harkerite (Hrk) and clintonite (Cln) aggregate with inclusions of spinel (Spl) in Crestmore marble #2A Mgt: magnetite, Anh: anhydrite, Cal: calcite. Location: Low-pressure contact aureole in the Crestmore quarry, Riverside County, California, USA. (CanMin, v37:277).Scale: See Image. © Canadian Mineralogist |
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Harkerite Crystallography
a:c = 1:1.84545
a = 18.131, c = 33.46, Z = 6; V = 9,525.77 Den(Calc)= 3.07
Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m
By Intensity(I/Io): 2.61(1), 1.84(0.9), 2.13(0.8),
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| | Giuseppetti G , Mazzi F , Tadini C , American Mineralogist , 62 (1977) p.263-272, The crystal structure of harkerite | | ----------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Harkerite
None
Colorless.
2.959
Transparent
Fluorescent, Long UV=weak dark red.
Vitreous (Glassy)
white
Optical Properties of Harkerite
colorless.
colorless.
CI meas= -0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2121,KPDmeas= 0.22,KC= 0.2106
Ncalc = 1.62 - 1.65
Uniaxial (?), a=1.649-1.653, b=1.649-1.653, bire=0.0000.
Calculated Properties of Harkerite
Bulk Density (Electron Density)=3.06 gm/cc
note: Specific Gravity of Harkerite =3.07 gm/cc.
Fermion Index = 0.01
Boson Index = 0.99
PEHarkerite = 4.59 barns/electron
U=PEHarkerite x rElectron Density= 14.06 barns/cc.
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Harkerite is Not Radioactive
Harkerite Classification
17.01.09.01 (17)Compound Carbonates
(17.01)with miscellaneous formulae
(17.01.09)Dana Group
17.01.09.01 Harkerite Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10•2(H2O) R 3m 3 2/m
06.AB.70 06 - BORATES
06.A - Monoborates
06.AB -BO3, with additional anions; 1(D) + OH, etc.
06.AB.70 Harkerite Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10•2(H2O) R 3m 3 2/m
Other Harkerite Information
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Links to other databases for Harkerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Harkerite
Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10•2(H2O)
Dana No: 17.01.09.01 Strunz No: 06.AB.70
Locality:
Notes: