Rumoiite
Rumoiite is an IMA-recognized mineral species in the native element class, with the chemical formula AuSn₂.
It crystallizes in the orthorhombic crystal system (space group Pbca).
Key properties: Mohs hardness 2.5; specific gravity 10.1; Gray streak; Metallic luster.
IMA symbol Rmo, IMA status: approved, named in 2019.
Found in fluvial placer deposits.
It is found associated with Gold, shosanbetsuite, yuanjiangite, aurostibite, anyuiite. Distribution From the Shosanbetsu river, Minamichiyoda, Shosanbetsu village, Haboro town.
The name refers to Rumoi province, where the studied material was collected.
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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