Mineralogy Database

Harkerite Mineral Data

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General Harkerite Information

Help on Chemical  Formula: Chemical Formula: Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10•2(H2O)
Help on Composition: Composition: 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
Help on Empirical Formula: Empirical Formula: Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10•2(H2O)
Help on Environment: Environment: Skarns in dolomitic limestones at the contact with granite
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1948
Help on Locality: Locality: Camas Malag, near Broadford, Isle of Skye, Scotland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alfred Harker (1859-1939), British petrologist, Cambridge University, Cambridge, England.
Help on Name Pronunciation: Name Pronunciation: Harkerite + Pronunciation Say HARKERITE
Help on Synonym: Synonym: ICSD 12105
  PDF 10-465

Harkerite Image

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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

Harkerite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.84545
Help on Cell Dimensions: Cell Dimensions: a = 18.131, c = 33.46, Z = 6; V = 9,525.77 Den(Calc)= 3.07
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.61(1), 1.84(0.9), 2.13(0.8),

Physical Properties of Harkerite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 2.959
Help on Diaphaneity: Diaphaneity: Transparent
Help on Luminescence: Luminescence: Fluorescent, Long UV=weak dark red.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Harkerite

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (?), a=1.649-1.653, b=1.649-1.653, bire=0.0000.

Calculated Properties of Harkerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.06 gm/cc
note: Specific Gravity of Harkerite =3.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEHarkerite = 4.59 barns/electron
U=PEHarkerite x rElectron Density= 14.06 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Harkerite is Not Radioactive

Harkerite Classification

Help on  Dana Class: Dana Class: (17)Compound Carbonates
  (17.01)with miscellaneous formulae
  (17.01.09)Dana Group Harkerite Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10•2(H2O) R 3m 3 2/m
Help on  Strunz Class: Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: 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

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Dana No: Strunz No: 06.AB.70





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