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George-ericksenite Mineral Data

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General George-ericksenite Information

Help on Chemical  Formula: Chemical Formula: Na6CaMg(IO3)6(CrO4)2•12(H2O)
Help on Composition: Composition: Molecular Weight = 1,699.91 gm
   Sodium      8.11 %  Na   10.94 % Na2O
   Calcium     2.36 %  Ca    3.30 % CaO
   Magnesium   1.43 %  Mg    2.37 % MgO
   Chromium    6.12 %  Cr   11.76 % CrO3
   Hydrogen    1.42 %  H    12.72 % H2O
   Iodine     44.79 %  I    58.91 % I2O5
   Oxygen     35.77 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na6CaMg(IO3)6(CrO4)2•12(H2O)
Help on Environment: Environment: Arid climate and associated with the Chilean nitrate caliche deposits.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Oficina Chacabuco, Chile Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after George E. Ericksen (1920-1996) of Reston, Virginia who conducted studies of nitrate deposits for the U.S.G.S.
Help on Synonym: Synonym: Georgeericksenite - Renamed to George-ericksenite by Mineralogical Record, v39 (2008), p131

George-ericksenite Image

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Comments: Scanning electron microscope (SEM) photomicrograph of part of a georgeericksenite aggregate: note the cracking of the crystals due to H2O loss under the SEM vacuum. (AmMin 83:391).
Location: Museum specimen labeled as originating from Oficina Chacabuco, Chile.. Scale: See Image.
© American Mineralogist

George-ericksenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.1656:1:1.4442
Help on Cell Dimensions: Cell Dimensions: a = 23.645, b = 10.918, c = 15.768, Z = 4; beta = 114.416° V = 3,706.56 Den(Calc)= 3.05
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.69(1), 3.051(0.8), 3.121(0.8),

Physical Properties of George-ericksenite

Help on Cleavage: Cleavage: None
Help on Color: Color: Pale yellow, Bright lemon yellow.
Help on Density: Density: 3.035
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pale yellow

Optical Properties of George-ericksenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2213,KPDmeas= 0.2224,KC= 0.23
Ncalc = 1.7
Help on Optical Data: Optical Data: Biaxial (+), a=1.647, b=1.674, g=1.704, bire=0.0570

Calculated Properties of George-ericksenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.83 gm/cc
note: Specific Gravity of George-ericksenite =3.04 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0074470613
Boson Index = 0.9925529387
Help on Photoelectric: Photoelectric: PEGeorge-ericksenite = 163.85 barns/electron
U=PEGeorge-ericksenite x rElectron Density= 463.39 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
George-ericksenite is Not Radioactive

George-ericksenite Classification

Help on  Dana Class: Dana Class: (23)Compound Iodates
  (23.01)with miscellaneous formulae
  (23.01.02)Fuenzalidaite Group Fuenzalidaite K6(Na,K)4Na6Mg10(SO4)12(IO3)12•12(H2O) P 3c1 3 2/m Carlosruizite K6(Na,K)4Na6Mg10(SeO4)12(IO3)12•12(H2O) P 3c1 3 2/m George-ericksenite! Na6CaMg(IO3)6(CrO4)2•12(H2O) C 2/c 2/m
Help on  Strunz Class: Strunz Class: 04.KD.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.K - Iodates
  04.KD -Iodates with additional anions, with H2O
04.KD.10 George-ericksenite! Na6CaMg(IO3)6(CrO4)2•12(H2O) C 2/c 2/m

Other George-ericksenite Information

Help on References: References: NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.83,p390-399,1998) OPTIC PROP.(AmMin)
Help on See Also: See Also: Links to other databases for George-ericksenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 04.KD.10





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