Harkerite Mineral Data

Harkerite Mineral Data +

General Harkerite Information

Chemical Formula:

Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10·2(H2O)

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

Empirical Formula:

Ca₂₄Mg₈Al₂(SiO₄)₈(BO₃)₆(CO₃)₁₀·2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1948

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 12105

PDF 10-465

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Harkerite Crystallography

Axial Ratios:

a:c = 1:1.84545

Cell Dimensions:

a = 18.131, c = 33.46, Z = 6; V = 9,525.77 Den(Calc)= 3.07

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.61(1), 1.84(0.9), 2.13(0.8),

Crystal Structure:

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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

Cleavage:

None

Color:

Colorless.

Density:

2.959

Diaphaniety:

Transparent

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Harkerite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

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

Optical Data:

Uniaxial (?), a=1.649-1.653, b=1.649-1.653, bire=0.0000.

Calculated Properties of Harkerite

Electron Density:

r_electron=3.06 gm/cc
note: r_Harkerite=3.07 gm/cc.

Fermion Index

Fermion Index = 0.0157
Boson Index = 0.9843

Photoelectric:

PE_Harkerite= 4.59 barns/electron
U=PE_Harkerite x r_electron= 14.06 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Harkerite is Not Radioactive

Harkerite Classification

Dana Class:

17.1.9.1 (17)Compound Carbonates

(17.1)with miscellaneous formulae

(17.1.9)Dana Group

17.1.9.1 Harkerite Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10·2(H2O) R 3m 3 2/m

Strunz Class:

VIII/B.31-60 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron

VIII/B.31 - Kornerupine - Harkerite series

VIII/B.31-10 Kornerupine (Mg,Fe)4(Al,Fe)6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

VIII/B.31-12 Prismatine! ([],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 C mcm 2/m 2/m 2/m

VIII/B.31-15 Magnesiodumortierite (Mg,Ti,[])<1(Al,Mg)2Al4Si3O18-y(OH)yBy=2-3 Pmcn 2/m 2/m 2/m

VIII/B.31-20 Dumortierite Al6.5-7(BO3)(SiO4)3(O,OH)3 Pcmn 2/m 2/m 2/m

VIII/B.31-30 Holtite Al6(Al,Ta)(BO3)[(SiO4,SbO4,AsO4)]3(O,OH)3 P nma 2/m 2/m 2/m

VIII/B.31-40 Grandidierite (Mg,Fe)Al3(BO4)(SiO4)O Pbnm 2/m 2/m 2/m

VIII/B.31-42 Ominelite! (Fe,Mg)Al3BSiO9 Pbnm 2/m 2/m 2/m

VIII/B.31-45 Boralsilite! Al16B6Si2O27 C 2/m 2/m

VIII/B.31-50 Werdingite (Mg,Fe)2Al14B4Si4O37 P1 1

VIII/B.31-60 Harkerite Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10·2(H2O) R 3m 3 2/m

Other Harkerite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Harkerite

Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10·2(H2O)
Dana No: 17.1.9.1 Strunz No: VIII/B.31-60
Locality:

Notes: