Miyahisaite exhibited at the Mining Museum of Akita University — Photo: 掬茶 · CC BY-SA 4.0
Miyahisaite
Miyahisaite is an IMA-recognized mineral species in the phosphate class, with the chemical formula (Sr,Ca)₂Ba₃(PO₄)₃F.
It crystallizes in the hexagonal crystal system (space group P6_3/m). It is a member of the Apatite structural group.
Key properties: Mohs hardness 5; specific gravity 4.511; White streak; Vitreous luster.
IMA symbol Miy, IMA status: approved, named in 2011.
Found in a metamorphosed (low grade) bedded Mn and chert deposit.
It is found associated with Fluorapatite, namansilite, quartz.
The mineral was named to honor Michitoshi Miyahisa (1928-1983) for his contribution to the study of ore deposits on Kyushu.
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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