Bultfonteinite Mineral Data

Bultfonteinite Mineral Data +

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General Bultfonteinite Information

Chemical Formula:

Ca2SiO2(OH,F)4

Composition:

Molecular Weight = 210.26 gm

Calcium 38.12 % Ca 53.34 % CaO

Silicon 13.36 % Si 28.58 % SiO₂

Hydrogen 1.44 % H 12.85 % H₂O

Oxygen 38.05 % O

Fluorine 9.04 % F 9.04 % F

- % F -3.80 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂SiO₂(OH)₃F

Environment:

In a large "horse" of diabase and shale fragments in a kimberlite pipe.

IMA Status:

Valid Species (Pre-IMA) 1932

Locality:

In South Africa, in Cape Province, in the Bultfontein and Dutoitspan diamond mines, Kimberley. Link to MinDat.org Location Data.

Name Origin:

For the Bultfontein mine, Kimberley, South Africa, where it was first discovered.

Synonym:

ICSD 45301

PDF 42-1435

Bultfonteinite Image

Images:

Bultfonteinite

Comments: Rounded, spherical aggregation of acicular bultfonteinite crystals.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 8.5 x 4.6 cm.
© John Veevaert

Images:

Bultfonteinite Oyelite

Comments: White encrustation of oyelite covering brownish botryoidal bultfonteinite.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 2 x 4 cm.
© John Veevaert

Images:

Bultfonteinite Poldervaartite

Comments: Bow-tie clusters of white, acicular bultfonteinite and blocky, beige-colored poldervaartite on matrix.
Location: N'Chwaning mine, South Africa. Scale: picture size 4 cm.
© John Veevaert

Bultfonteinite Crystallography

Axial Ratios:

a:b:c =0.7459:1:0.508

Cell Dimensions:

a = 8.34, b = 11.18, c = 5.68, Z = 4; alpha = 91.983°, beta = 94.283°, gamma = 90.75° V = 527.77 Den(Calc)= 2.65

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 1.93(1), 2.92(0.6), 8.12(0.6),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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McIver E J , Acta Crystallographica , 16 (1963) p.551-558, The structure of bultfonteinite, Ca4Si2O10F2H6, Locality: Bultfontein mine, Kimberley, South Africa

Physical Properties of Bultfonteinite

Cleavage:

[010] Distinct, [100] Distinct

Color:

Colorless, Pink.

Density:

2.73

Diaphaniety:

Transparent

Hardness:

4.5 - Between Fluorite and Apatite

Streak:

white

Optical Properties of Bultfonteinite

Gladstone-Dale:

CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2231,KPDmeas= 0.2166,KC= 0.2194

Optical Data:

Biaxial (+), a=1.587, b=1.59, g=1.597, bire=0.0100

Calculated Properties of Bultfonteinite

Electron Density:

r_electron=2.75 gm/cc
note: r_{Bultfonteinite}=2.73 gm/cc.

Fermion Index

Fermion Index = 0.00693
Boson Index = 0.99307

Photoelectric:

PE_{Bultfonteinite}= 5.22 barns/electron
U=PE_{Bultfonteinite} x r_electron= 14.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bultfonteinite is Not Radioactive

Bultfonteinite Classification

Dana Class:

52.4.7.2 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.7)Afwillite and related species

52.4.7.1 Afwillite Ca3Si2O4(OH)6 P 2₁ 2

52.4.7.2 Bultfonteinite Ca2SiO2(OH,F)4 P1 1

52.4.7.3 Hatrurite Ca3SiO5 R 3m 3m

52.4.7.4 Jasmundite Ca11(SiO4)4O2S I 42m 4 2m

Strunz Class:

VIII/B.22-40 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.22 - Thaumasite series

VIII/B.22-10 Hatrurite Ca3SiO5 R 3m 3m

VIII/B.22-25 Poldervaartite (Ca,Mn)2SiO3(OH)2 P bca 2/m 2/m 2/m

VIII/B.22-30 Afwillite Ca3Si2O4(OH)6 P 2₁ 2

VIII/B.22-40 Bultfonteinite Ca2SiO2(OH,F)4 P1 1

VIII/B.22-50 Spurrite Ca5(SiO4)2(CO3) P 2₁/a 2/m

VIII/B.22-60 Paraspurrite Ca5(SiO4)2(CO3) P 2₁/a 2/m

VIII/B.22-65 Ternesite! Ca5(SiO4)2SO4 P nma 2/m 2/m 2/m

VIII/B.22-70 Nagelschmidtite Ca7(SiO4)3(PO4)2 Unk Hex

VIII/B.22-75 Harrisonite! Ca(Fe,Mg)6(PO4)2(SiO4)2 R 3m 3 2/m

VIII/B.22-80 Fukalite Ca4Si2O6(CO3)(OH,F)2 Unk Ortho

VIII/B.22-90 Thaumasite Ca3Si(CO3)(SO4)(OH)6·12(H2O) P 6₃/m 6/m

VIII/B.22-100 Chelyabinskite* (Ca,Mg)3Si(OH)6(SO4,CO3)2·9(H2O) Unk Ortho

Other Bultfonteinite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Bultfonteinite

Ca2SiO2(OH,F)4
Dana No: 52.4.7.2 Strunz No: VIII/B.22-40
Locality:

Notes: