Simplotite
Simplotite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula CaV⁴⁺₄O₉·5H₂O.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 1; specific gravity 2.64; Brownish black streak; Vitreous luster; optically biaxial.
IMA symbol Spo, grandfathered status — known before the IMA’s founding, named in 1956.
A secondary mineral on fracture surfaces and replacing fossil wood in Colorado Plateau-type U–V deposits.
It is found associated with Montroseite, duttonite, melanovanadite, selenium, uraninite, coffinite, vanadiferous silicates.
The name refers to John Richard Simplot (1909–), Boise, Idaho, of the J.R. Simplot Mining Co., which owned the Peanut mine.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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