Mikasaite ore displayed at Mining Museum of Akita University — Photo: 掬茶 · CC BY-SA 4.0
Mikasaite
Mikasaite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Fe³⁺₂(SO₄)₃.
It crystallizes in the hexagonal crystal system (space group R-3). It is a member of the Millosevichite structural group.
Key properties: specific gravity 3.06; White to pale brown streak; optically uniaxial.
IMA symbol Mik, IMA status: approved, named in 1992.
Forms as a sublimate around a burning coal-gas escape fracture, formed at > 300 ° C.
The name refers to its occurrence near Mikasa, Japan.
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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