Specific gravity: 6.83 calculated
Hardness: 2½ to 3
Tsugaruite is a very rare arsenic-bearing mineral.
At the type locality, the Yunosawa mine, Ikarigaseki, Minamitsugaru District, Aomori Prefecture, Japan, tsugaruite was found as tabular crysstals to 2 mm in a thin hydrothermal baryte veinlet. Associated minerals include jordanite, wurtzite, marcasite and galena. The jordanite formed earlier than the tsugaruite (MM 62.793-799, AM 84.992).
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