George-ericksenite
A pale-yellow sodium-calcium iodate-chromate from Chilean nitrate deposits.
Intro adapted from Wikipedia (CC BY-SA).
George-ericksenite is an IMA-recognized mineral species in the chromate class, with the chemical formula Na₆CaMg(IO₃)₆(CrO₄)₂·12H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 3–4; specific gravity 3.035; Pale yellow streak; Vitreous luster; optically biaxial.
IMA symbol Gek, IMA status: approved, named in 1996.
On a museum specimen from a nitrate deposit.
It is found associated with Halite, nitratine, niter.
The mineral was named to honor George E. Ericksen (1920–1996), research geologist, U.S. Geological Survey, Reston, Virginia, USA, who studied Chilean nitrate deposits.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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