George-ericksenite
A valid IMA mineral species
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George E. Ericksen
Formula:
Na6CaMg(IO3)6(CrO4)2 · 12H2O
Colour:
Bright lemon-yellow (aggregates), pale yellow (crystals)
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
3.035 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of George E. Ericksen (17 March 1920, Butte, Montana, USA - 14 January 1996, Reston, Virginia, USA), geologist with the U.S. Geological Survey who conducted studies of nitrate deposits in South America. The original name did not include a hyphen, that was added in 2008 by the IMA (Burke 2008).
Unique combination of elements. The second approved iodate-chromate mineral after dietzeite, although there is the unnamed 'UM1998://:IOCrO-CaClKTi' which associates with george-ericksenite.
The crystal structure contains:
- single unique [4]Cr(S) site
- single unique [6]Mg site (octahedral)
- 3 independent [6]I sites, coordinated by O atoms and water groups
- 3 independent Na sites: (1) octahedral, (2) augmented octahedral, and (3) triangular dodecahedral
- single unique Ca site, square antiprismatic coordination
- 6 unique water groups.
The cation polyhedra are corner-, edge-, and face-sharing and thus form heteropolyhedral slabs || (100), linked by hydrogen bonds.
The crystal structure contains:
- single unique [4]Cr(S) site
- single unique [6]Mg site (octahedral)
- 3 independent [6]I sites, coordinated by O atoms and water groups
- 3 independent Na sites: (1) octahedral, (2) augmented octahedral, and (3) triangular dodecahedral
- single unique Ca site, square antiprismatic coordination
- 6 unique water groups.
The cation polyhedra are corner-, edge-, and face-sharing and thus form heteropolyhedral slabs || (100), linked by hydrogen bonds.
Unique Identifiers
Mindat ID:
6968
Long-form identifier:
mindat:1:1:6968:3
GUID
(UUID V4):
(UUID V4):
0f1524cd-f6d4-4242-bab8-44e347d58bbd
IMA Classification of George-ericksenite
Approved
First published:
1998
Classification of George-ericksenite
4.KD.10
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
K : Iodates: Trigonal [IO3] pyramids (mostly).
D : Iodates with additional anions, with H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
K : Iodates: Trigonal [IO3] pyramids (mostly).
D : Iodates with additional anions, with H2O
Dana 7th ed.:
23.1.3.1
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Gek | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of George-ericksenite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of George-ericksenite
Vitreous
Transparency:
Transparent
Colour:
Bright lemon-yellow (aggregates), pale yellow (crystals)
Streak:
Pale yellow
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Density:
3.035 g/cm3 (Calculated)
Optical Data of George-ericksenite
Type:
Biaxial (+)
RI values:
nα = 1.647 nβ = 1.674 nγ = 1.704
2V:
Calculated: 88.4°
Max Birefringence:
δ = 0.057
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r < v weak
Optical Extinction:
Z ~ c.
Pleochroism:
Weak
Comments:
X = very pale yellow; Z = distinct yellow-green.
Chemistry of George-ericksenite
Mindat Formula:
Na6CaMg(IO3)6(CrO4)2 · 12H2O
Crystallography of George-ericksenite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 23.645(2) Å, b = 10.918(1) Å, c = 15.768(1) Å
β = 114.42(6)°
β = 114.42(6)°
Ratio:
a:b:c = 2.166 : 1 : 1.444
Unit Cell V:
3707.3 ų
Z:
4
Morphology:
Major forms: {100}, {110}; minor one: {233}.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0001979 | George-ericksenite | Cooper M A, Hawthorne F C, Roberts A C, Grice J D, Stirling J A R, Moffatt E A (1998) Georgeericksenite, Na6CaMg(IO3)6(CrO4)2(H2O)12, a new mineral from Oficina Chacabuco, Chile: Description and crystal structure American Mineralogist 83 390-399 |  | 1998 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.69 Å | (100) |
| 3.121 Å | (80) |
| 3.051 Å | (80) |
| 3.590 Å | (70) |
| 6.36 Å | (50) |
| 5.65 Å | (50) |
| 4.36 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 57 : Other minerals formed by human processes |
Type Occurrence of George-ericksenite
General Appearance of Type Material:
Isolated and grouped 0.2 mm sized micronodules of crystals; prismatic to acicular crystals are 30 x 5 x 5 microns in size on average, elongated along [001] and somewhat flattened on {110}, with 6:1 length-to-width ratio.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Canada, 829.
Geological Setting of Type Material:
Halite-nitratine-niter matrix.
Associated Minerals at Type Locality:
Reference:
Cooper, M.A., Hawthorne, F.C., Roberts, A.C., Grice, J.D., Stirling, J.A.R., Moffatt, E.A. (1998) Georgeericksenite, Na6CaMg(IO3)6(CrO4)2(H2O)12, a new mineral from Oficina Chacabuco, Chile: Description and crystal structure. American Mineralogist: 83: 390-399.
Synonyms of George-ericksenite
Other Language Names for George-ericksenite
Related Minerals - Strunz-mindat Grouping
| 4.KD.05 | Dietzeite | Ca2(IO3)2(CrO4) · H2O |
Fluorescence of George-ericksenite
Non-fluorescent.
Other Information
Notes:
Extremely soluble in cold water.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for George-ericksenite
mindat.org URL:
https://www.mindat.org/min-6968.html
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References for George-ericksenite
Localities for George-ericksenite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Chile (TL) | |
| Cooper et al. (1998) |
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