Bultfonteinite Mineral Data

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. Name Pronunciation: Bultfonteinite + Pronunciation 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 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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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 Diaphaneity: 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
Ncalc = 1.58 - 1.6 Optical Data: Biaxial (+), a=1.587, b=1.59, g=1.597, bire=0.0100  

Calculated Properties of Bultfonteinite

Electron Density: Bulk Density (Electron Density)=2.75 gm/cc
note: Specific Gravity of Bultfonteinite =2.73 gm/cc.
Fermion Index: Fermion Index = 0.006937366
Boson Index = 0.993062634 Photoelectric: PE_{Bultfonteinite} = 5.22 barns/electron
U=PE_{Bultfonteinite} x rElectron Density= 14.37 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bultfonteinite is Not Radioactive  

Bultfonteinite Classification

Dana Class: 52.04.07.02 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O   (52.04)with cations in [6] and/or > [6] coordination   (52.04.07)Afwillite and related species  

52.04.07.01 Afwillite Ca3Si2O4(OH)6 P 2₁ 2

 

52.04.07.02 Bultfonteinite Ca2SiO2(OH,F)4 P1 1

 

52.04.07.03 Hatrurite Ca3SiO5 R 3m 3m

 

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

Strunz Class: 09.AG.80 09 - SILICATES (Germanates)   09.A - Nesosilicates   09.AG -Nesosilicates with additional anions; cations in > [6] ± [6] coordination  

09.AG.80 Bultfonteinite Ca2SiO2(OH,F)4 P1 1

 

Other Bultfonteinite Information

References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) See Also: Links to other databases for Bultfonteinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST
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