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Bultfonteinite Mineral Data

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General Bultfonteinite Information

Help on Chemical  Formula: Chemical Formula: Ca2SiO2(OH,F)4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca2SiO2(OH)3F
Help on Environment: Environment: In a large "horse" of diabase and shale fragments in a kimberlite pipe.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1932
Help on Locality: Locality: In South Africa, in Cape Province, in the Bultfontein and Dutoitspan diamond mines, Kimberley. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the Bultfontein mine, Kimberley, South Africa, where it was first discovered.
Help on Name Pronunciation: Name Pronunciation: Bultfonteinite + Pronunciation Say BULTFONTEINITE
Help on Synonym: Synonym: ICSD 45301
  PDF 42-1435
 

Bultfonteinite Image

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  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

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  Oyelite   Bultfonteinite

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

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.7459:1:0.508
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.93(1), 2.92(0.6), 8.12(0.6),
 

Physical Properties of Bultfonteinite

Help on Cleavage: Cleavage: {010} Distinct, {100} Distinct
Help on Color: Color: Colorless, Pink.
Help on Density: Density: 2.73
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Streak: Streak: white
 

Optical Properties of Bultfonteinite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.587, b=1.59, g=1.597, bire=0.0100
 

Calculated Properties of Bultfonteinite

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

Bultfonteinite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic2) 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 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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Print or Cut-and-Paste your Bultfonteinite Specimen Label here :

Bultfonteinite

Ca2SiO2(OH,F)4
Dana No: 52.04.07.02 Strunz No: 09.AG.80
Locality:

 

Notes:

 

 
   
 


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