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General Gearksutite Information |
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 Chemical Formula: |
CaAl(OH,F)5•(H2O) | ||
| Composition: |
Molecular Weight = 178.08 gm | ||
| Calcium 22.51 % Ca 31.49 % CaO | |||
| Aluminum 15.15 % Al 28.63 % Al2O3 | |||
| Hydrogen 1.70 % H 15.17 % H2O | |||
| Oxygen 17.97 % O | |||
| Fluorine 42.67 % F 42.67 % F | |||
| - % F -17.97 % -O=F2 | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
CaAl(OH)F4•(H2O) | ||
| Environment: |
Alteration product of cryolite. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1868 | ||
| Locality: |
Greenland and Ural Mountains, Russia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named from the Greek "Ge", for earth because it is usually earthy and arksutite, from the locality near Arksut fjord. | ||
| Name Pronunciation: |
Gearksutite + Pronunciation  |
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| Synonym: |
Boldyrevite - impure ralstonite or gearksutite | ||
| ICSD 89800 | |||
| Paragearksutite | |||
Gearksutite Image | |||
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Images:
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Gearksutite Crystallography |
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| Crystal System: |
Monoclinic | ||
| X Ray Diffraction: |
By Intensity(I/Io): 4.55(1), 2.28(0.8), 3.15(0.8), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Gearksutite |
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| Cleavage: |
None | ||
| Color: |
White. | ||
| Density: |
2.75 | ||
| Diaphaneity: |
Transparent to subtranslucent | ||
| Fracture: |
Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments. | ||
| Habit: |
Acicular - Occurs as needle-like crystals. | ||
| Habit: |
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). | ||
| Hardness: |
2 - Gypsum | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Vitreous - Dull | ||
| Magnetism: |
Nonmagnetic | ||
| Streak: |
white | ||
Optical Properties of Gearksutite |
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| Optical Data: |
Biaxial (-), a=1.448, b=1.454, g=1.456, bire=0.0080 | ||
Calculated Properties of Gearksutite |
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| Electron Density: |
Bulk Density (Electron Density)=2.72 gm/cc note: Specific Gravity of Gearksutite =2.75 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.0003926323 Boson Index = 0.9996073677 |
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| Photoelectric: |
PEGearksutite = 3.48 barns/electron U=PEGearksutite x rElectron Density= 9.46 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Gearksutite is Not Radioactive |
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Gearksutite Classification |
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| Dana Class: |
11.06.08.01 (11)Halide Complexes; Alumino-fluorides | ||
| (11.06)with miscellaneous formulae | |||
| (11.06.08)Dana Group | |||
| Strunz Class: |
03.CC.05 03 - HALIDES | ||
| 03.C - Complex Halides | |||
| 03.CC -Soro-aluminofluorides | |||
Other Gearksutite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Gearksutite : 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 Search for Gearksutite using: Visit our Advertisers for Gearksutite : A Bijoux Google Search for GearksutiteAdam's Minerals Google Search for Gearksutite Cape Minerals Google Search for Gearksutite Dakota Matrix Minerals Google Search for Gearksutite Excalibur Mineral Corp. Google Search for Gearksutite Exceptional Minerals Google Search for Gearksutite John Betts Fine Minerals Search for Gearksutite McDougall Minerals Google Search for Gearksutite Mineral News Website Link Rock and Mineral Shows Google Search for Gearksutite Weinrich Minerals, Inc. Google Search for Gearksutite Ask about Gearksutite here : Print or Cut-and-Paste your Gearksutite Specimen Label here :
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