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Brenkite Mineral Data
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General Brenkite Information
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 Chemical Formula: |
Ca2(CO3)F2 |
| Composition: |
Molecular Weight = 178.16 gm |
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Calcium 44.99 % Ca 62.95 % CaO |
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Carbon 6.74 % C 24.70 % CO2 |
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Oxygen 26.94 % O |
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Fluorine 21.33 % F 21.33 % F |
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- %
F -8.98 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca2(CO3)F2 |
| Environment: |
Voids and fissures in a porphryritic selbergite. |
| IMA Status: |
Approved IMA 1978 |
| Locality: |
Schellkopf, 0.5 km west of Brenk, Eifel district, Germany. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Brenkite  |
| Synonym: |
ICSD 100607 |
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PDF 29-322 |
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Brenkite Image |
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Images:
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Brenkite
Comments: Spherical aggregate of colorless crystals of brenkite.
Location: Schellkopf, Brenk, Eifel Mts, Rhineland-Palatinate, Germany.
Scale: Picture size 7.5 mm.
© Thomas Witzke / Abraxas-Verlag |
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Brenkite Crystallography
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| Axial Ratios: |
a:b:c =1.0132:1:0.8672 |
| Cell Dimensions: |
a = 7.65, b = 7.55, c = 6.548, Z = 4; V = 378.20 Den(Calc)= 3.13 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bcn |
| X Ray Diffraction: |
By Intensity(I/Io): 2.794(1), 3.006(0.8), 3.028(0.8), |
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Physical Properties of Brenkite
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| Cleavage: |
None |
| Color: |
Colorless. |
| Density: |
3.1 |
| Diaphaneity: |
Transparent |
| Streak: |
white |
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Optical Properties of Brenkite
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| Optical Data: |
Biaxial (-), a=1.525, b=1.59, g=1.593, bire=0.0680, 2V(Calc)=22, 2V(Meas)=26-28. |
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Calculated Properties of Brenkite
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| Electron Density: |
Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Brenkite =3.13 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0014782654
Boson Index = 0.9985217346 |
| Photoelectric: |
PEBrenkite = 5.76 barns/electron
U=PEBrenkite x rElectron Density= 17.80 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brenkite is Not Radioactive |
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Brenkite Classification
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| Dana Class: |
16a.03.06.01 (16a)Carbonates - Hydroxyl or Halogen |
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(16a.03)where (A B)2 (XO3) Zq |
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(16a.03.06)Dana Group |
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16a.03.06.01 Brenkite Ca2(CO3)F2 P bcn 2/m 2/m 2/m |
| Strunz Class: |
05.BC.05 05 - CARBONATES (NITRATES) |
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05.B - Carbonates with additional anions, without H2O |
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05.BC -With alkali-earth cations |
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05.BC.05 Brenkite Ca2(CO3)F2 P bcn 2/m 2/m 2/m |
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Other Brenkite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Brenkite :
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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Brenkite Specimen Label here :
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Brenkite
Ca2(CO3)F2
Dana No: 16a.03.06.01 Strunz No: 05.BC.05
Locality:
Notes:
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