George-ericksenite Mineral Data

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General George-ericksenite Information

Chemical Formula:

Na6CaMg(IO3)6(CrO4)2•12(H2O)

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

Empirical Formula:

Na₆CaMg(IO₃)₆(CrO₄)₂•12(H₂O)

Environment:

Arid climate and associated with the Chilean nitrate caliche deposits.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Oficina Chacabuco, Chile Link to MinDat.org Location Data.

Name Origin:

Named after George E. Ericksen (1920-1996) of Reston, Virginia who conducted studies of nitrate deposits for the U.S.G.S.

Synonym:

Georgeericksenite - Renamed to George-ericksenite by Mineralogical Record, v39 (2008), p131

IMA1996-049

George-ericksenite Image

Images:

George-ericksenite

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

Axial Ratios:

a:b:c =2.1656:1:1.4442

Cell Dimensions:

a = 23.645, b = 10.918, c = 15.768, Z = 4; beta = 114.416° V = 3,706.56 Den(Calc)= 3.05

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10.69(1), 3.051(0.8), 3.121(0.8),

Crystal Structure:

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Cooper M A , Hawthorne F C , Roberts A C , Grice J D , Stirling J A R , Moffatt E A , American Mineralogist , 83 (1998) p.390-399, Georgeericksenite, Na6CaMg(IO3)6(CrO4)2(H2O)12, a new mineral from Oficina, Chacabuco, Chile: Description and crystal structure

Physical Properties of George-ericksenite

Cleavage:

None

Color:

Pale yellow, Bright lemon yellow.

Density:

3.035

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

pale yellow

Optical Properties of George-ericksenite

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

Optical Data:

Biaxial (+), a=1.647, b=1.674, g=1.704, bire=0.0570

Calculated Properties of George-ericksenite

Electron Density:

Bulk Density (Electron Density)=2.83 gm/cc
note: Specific Gravity of George-ericksenite =3.04 gm/cc.

Fermion Index:

Fermion Index = 0.0074470613
Boson Index = 0.9925529387

Photoelectric:

PE_{George-ericksenite}= 163.85 barns/electron
U=PE_{George-ericksenite} x rElectron Density= 463.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
George-ericksenite is Not Radioactive

George-ericksenite Classification

Dana Class:

23.01.02.03 (23)Compound Iodates

(23.01)with miscellaneous formulae

(23.01.02)Fuenzalidaite Group

23.01.02.01 Fuenzalidaite K6(Na,K)4Na6Mg10(SO4)12(IO3)12•12(H2O) P 3c1 3 2/m

23.01.02.02 Carlosruizite K6(Na,K)4Na6Mg10(SeO4)12(IO3)12•12(H2O) P 3c1 3 2/m

23.01.02.03 George-ericksenite! Na6CaMg(IO3)6(CrO4)2•12(H2O) C 2/c 2/m

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

References:

NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.83,p390-399,1998) OPTIC PROP.(AmMin)

See Also:

Links to other databases for George-ericksenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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George-ericksenite

Na6CaMg(IO3)6(CrO4)2•12(H2O)
Dana No: 23.01.02.03 Strunz No: 04.KD.10
Locality:

Notes: