Gearksutite Mineral Data + Say GEARKSUTITE


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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 Synonym: Synonym: ICSD 89800
 

Gearksutite Image

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Gearksutite

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),
Click Here for Large Gearksutite Structure Window Crystal Structure:

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Marchetti F , Perchiazzi N , American Mineralogist , 85 (2000) p.231-235, The crystal structure of gearksutite, CaAlF4(OH).H2O

 

Physical Properties of Gearksutite

Help on Cleavage: Cleavage: None
Help on Color: Color: White.
Help on Density: Density: 2.75
Help on Diaphaniety: Diaphaniety: 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 Gladstone-Dale: Gladstone-Dale: CI meas= 0.165 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1646,KC= 0.197
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:

relectron=2.72 gm/cc
note: rGearksutite =2.75 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00039
Boson Index = 0.99961
Help on Photoelectric: Photoelectric:

PEGearksutite = 3.48 barns/electron
U=PEGearksutite x relectron= 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: 11.6.8.1 (11)Halide Complexes; Alumino-fluorides
  (11.6)with miscellaneous formulae
  (11.6.8)Dana Group
 
11.6.8.1 Gearksutite CaAl(OH,F)5·(H2O) Mono
Help on Strunz Class: Strunz Class: III/C.01-10 III - Halogenides
  III/C - Double halogenides with water, Fluorides
  III/C.01 - Gearksutite - Chukhrovite - (Ce) series
 
III/C.01-10 Gearksutite CaAl(OH,F)5·(H2O) Mono
 
III/C.01-20 Acuminite SrAlF4(OH)·(H2O) C 2/c 2/m
 
III/C.01-30 Tikhonenkovite SrAl(OH)F4·(H2O) Unk Mono
 
III/C.01-35 Artroeite PbAlF3(OH)2 P1 1
 
III/C.01-40 Creedite Ca3Al2(SO4)(F,OH)10·2(H2O) C 2/c 2/m
 
III/C.01-50 Chukhrovite-(Y) Ca3(Y,Ce)Al2(SO4)F13·10(H2O) F d3 2/m 3
 
III/C.01-60 Chukhrovite-(Ce) Ca3(Ce,Y)Al2(SO4)F13·10(H2O) F d3 2/m 3
 

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Gearksutite

CaAl(OH,F)5·(H2O)
Dana No: 11.6.8.1 Strunz No: III/C.01-10
Locality:

 

Notes:

 
 
   
 
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