Barentsite Mineral Data + 
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- 13.1.8.1 Barentsite Na7AlH2(CO3)4F4 P1 or P1 Tri
- V/C.02-10 Barentsite Na7AlH2(CO3)4F4 P1 or P1 Tri
- V/C.02-20 Dawsonite NaAl(CO3)(OH)2 Imam 2/m 2/m 2/m
- V/C.02-30 Tunisite NaCa2Al4(CO3)4(OH)8Cl P 4/nmm 4/m 2/m 2/m
General Barentsite Information |
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 Chemical Formula: |
Na7AlH2(CO3)4F4 | ||
| Composition: |
Molecular Weight = 505.96 gm | ||
| Sodium 31.81 % Na 42.87 % Na2O | |||
| Aluminum 5.33 % Al 10.08 % Al2O3 | |||
| Hydrogen 0.40 % H 3.56 % H2O | |||
| Carbon 9.50 % C 34.79 % CO2 | |||
| Oxygen 37.95 % O | |||
| Fluorine 15.02 % F 15.02 % F | |||
| - % F -6.32 % -O=F2 | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Na7AlH2(CO3)4F4 | ||
| Environment: |
Drill core in pegmatitic rock. | ||
| IMA Status: |
Approved IMA 1983 | ||
| Locality: |
Mt. Restinyon, Kola Peninsula, Russia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named to honor Dutch sailor Willem Barents and the sea that washes the Kola Peninsula. | ||
| Synonym: |
ICSD 77052 | ||
| PDF 35-693 | |||
Barentsite Image | |||
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Images:
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Barentsite Crystallography |
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| Axial Ratios: |
a:b:c =0.9609:1:1.3074 | ||
| Cell Dimensions: |
a = 6.472, b = 6.735, c = 8.806, Z = 1; alpha = 92.5°, beta = 97.33°, gamma = 119.32° V = 331.62 Den(Calc)= 2.53 | ||
| Crystal System: |
TriclinicSpace Group: P1 or P1 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.658(1), 2.778(1), 2.887(0.84), | ||
Physical Properties of Barentsite |
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| Cleavage: |
[001] Perfect, [100] Perfect | ||
| Color: |
Colorless. | ||
| Density: |
2.56 | ||
| Diaphaniety: |
Transparent | ||
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes | ||
| Hardness: |
3 - Calcite | ||
| Luster: |
Vitreous - Pearly | ||
| Streak: |
white | ||
Optical Properties of Barentsite |
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| Gladstone-Dale: |
CI meas= 0.087 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.076 (Fair) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1801,KPDmeas= 0.178,KC= 0.1949 |
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| Optical Data: |
Biaxial (-), a=1.358, b=1.479, g=1.53, bire=0.1720, 2V(Calc)=60, 2V(Meas)=62. Dispersion r < v weak. | ||
Calculated Properties of Barentsite |
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| Electron Density: |
relectron=2.48 gm/cc |
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| Fermion Index |
Fermion Index = 0.00122 Boson Index = 0.99878 |
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| Photoelectric: |
PEBarentsite = 0.86 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Barentsite is Not Radioactive |
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Barentsite Classification |
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| Dana Class: |
13.1.8.1 (13)Acid Carbonates | ||
| (13.1)with miscellaneous formulae | |||
| (13.1.8)Dana Group | |||
| Strunz Class: |
V/C.02-10 V - Nitrates, Carbonates and Borates | ||
| V/C - Waterfree carbonates with unfamiliar anions | |||
| V/C.02 - Barentsite - Tunisite series | |||
Other Barentsite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Barentsite : 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 Barentsite using: Visit our Advertisers for Barentsite : Translate Barentsite Mineral Data : Ask about Barentsite here : Print or Cut-and-Paste your Barentsite Specimen Label here :
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