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Gearksutite Mineral Data
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General Gearksutite Information
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 Chemical Formula: |
CaAl(OH,F)5•(H2O) |
| Composition: |
Molecular Weight = 178.08 gm |
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Calcium 22.51 % Ca 31.49 % CaO |
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Aluminum 15.15 % Al 28.63 % Al2O3 |
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Hydrogen 1.70 % H 15.17 % H2O |
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Oxygen 17.97 % O |
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Fluorine 42.67 % F 42.67 % F |
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- %
F -17.97 % -O=F2 |
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______ ______ |
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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  |
| Synonym: |
Boldyrevite - impure ralstonite or gearksutite |
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ICSD 89800 |
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Paragearksutite |
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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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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 |
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Optical Properties of Gearksutite
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| Optical Data: |
Biaxial (-), a=1.448, b=1.454, g=1.456, bire=0.0080 |
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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 |
| 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 |
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(11.06)with miscellaneous formulae |
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(11.06.08)Dana Group |
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11.06.08.01 Gearksutite CaAl(OH,F)5•(H2O) Mono |
| Strunz Class: |
03.CC.05 03 - HALIDES |
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03.C - Complex Halides |
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03.CC -Soro-aluminofluorides |
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03.CC.05 Gearksutite CaAl(OH,F)5•(H2O) Mono |
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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
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Print or Cut-and-Paste your Gearksutite Specimen Label here :
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Gearksutite
CaAl(OH,F)5•(H2O)
Dana No: 11.06.08.01 Strunz No: 03.CC.05
Locality:
Notes:
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