Mineralogy Database

Gearksutite Mineral Data

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General Gearksutite Information

Help on Chemical  Formula: Chemical Formula: CaAl(OH,F)5•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: CaAl(OH)F4•(H2O)
Help on Environment: Environment: Alteration product of cryolite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1868
Help on Locality: Locality: Greenland and Ural Mountains, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek "Ge", for earth because it is usually earthy and arksutite, from the locality near Arksut fjord.
Help on Name Pronunciation: Name Pronunciation: Gearksutite + Pronunciation Say GEARKSUTITE
Help on Synonym: Synonym: Boldyrevite - impure ralstonite or gearksutite
  ICSD 89800

Gearksutite Image

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Comments: White gearksutite crust on quartz.
Location: Saint Peter's Dome, El Paso County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gearksutite Crystallography

Help on Crystal System: Crystal System: Monoclinic
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.55(1), 2.28(0.8), 3.15(0.8),

Physical Properties of Gearksutite

Help on Cleavage: Cleavage: None
Help on Color: Color: White.
Help on Density: Density: 2.75
Help on Diaphaneity: Diaphaneity: Transparent to subtranslucent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Dull
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Gearksutite

Help on Optical Data: Optical Data: Biaxial (-), a=1.448, b=1.454, g=1.456, bire=0.0080

Calculated Properties of Gearksutite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Gearksutite =2.75 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0003926323
Boson Index = 0.9996073677
Help on Photoelectric: Photoelectric: PEGearksutite = 3.48 barns/electron
U=PEGearksutite x rElectron Density= 9.46 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gearksutite is Not Radioactive

Gearksutite Classification

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.06)with miscellaneous formulae
  (11.06.08)Dana Group Gearksutite CaAl(OH,F)5•(H2O) Mono
Help on  Strunz Class: Strunz Class: 03.CC.05 03 - HALIDES
  03.C - Complex Halides
  03.CC -Soro-aluminofluorides
03.CC.05 Gearksutite CaAl(OH,F)5•(H2O) Mono

Other Gearksutite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 03.CC.05





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