Brenkite Mineral Data + 
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- 16a.3.6.1 Brenkite Ca2(CO3)F2 P bcn 2/m 2/m 2/m
- V/C.06-10 Brenkite Ca2(CO3)F2 P bcn 2/m 2/m 2/m
- V/C.06-20 Holdawayite Mn6(CO3)2(OH)7(Cl,OH) C 2/m 2/m
- V/C.06-25 Rouvilleite Na3Ca2(CO3)3F Cc,C 2/c Mono
- V/C.06-27 Sheldrickite! NaCa3(CO3)2F3·(H2O) P 32 3
- V/C.06-30 Defernite Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x(x=0,5) Pnam 2/m 2/m 2/m
General Brenkite Information |
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 Chemical Formula: |
Ca2(CO3)F2 | ||
| Composition: |
Molecular Weight = 178.16 gm | ||
| Calcium 44.99 % Ca 62.95 % CaO | |||
| Carbon 6.74 % C 24.70 % CO2 | |||
| Oxygen 26.94 % O | |||
| Fluorine 21.33 % F 21.33 % F | |||
| - % F -8.98 % -O=F2 | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Ca2(CO3)F2 | ||
| IMA Status: |
Approved IMA 1978 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Synonym: |
ICSD 100607 | ||
| PDF 29-322 | |||
Brenkite Image | |||
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Images:
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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 - DipyramidalH-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), | ||
Physical Properties of Brenkite |
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| Cleavage: |
None | ||
| Color: |
Colorless. | ||
| Density: |
3.1 | ||
| Diaphaniety: |
Transparent | ||
| Streak: |
white | ||
Optical Properties of Brenkite |
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| Gladstone-Dale: |
CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1819,KPDmeas= 0.1837,KC= 0.1943 |
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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. | ||
Calculated Properties of Brenkite |
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| Electron Density: |
relectron=3.06 gm/cc |
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| Fermion Index |
Fermion Index = 0.00147 Boson Index = 0.99853 |
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| Photoelectric: |
PEBrenkite = 5.76 barns/electron |
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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.3.6.1 (16a)Carbonates - Hydroxyl or Halogen | ||
| (16a.3)where (A B)2 (XO3) Zq | |||
| (16a.3.6)Dana Group | |||
| Strunz Class: |
V/C.06-10 V - Nitrates, Carbonates and Borates | ||
| V/C - Waterfree carbonates with unfamiliar anions | |||
| V/C.06 - Brenkite - Defernite series | |||
Other Brenkite Information |
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| References: |
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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris Search for Brenkite using: Visit our Advertisers for Brenkite : Translate Brenkite Mineral Data : Ask about Brenkite here : Print or Cut-and-Paste your Brenkite Specimen Label here :
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