Sulphosalt, bismuth-bearing mineral
Specific gravity: 6.06 calculated
Colour: Pale grey to greyish-white in reflected light
Miharaite occurs in skarn, as a product of
contact metamorphism (Mindat). Associated
minerals include wittichenite,
At the type locality, the Honpi deposit, Mihara mine, Higashi-Mihara, Ibara City, Okayama Prefecture, Japan, the deposit is a is a metasomatic bornite-rich skarn deposit of copper. The bornite occurs as disseminations in a hedenbergite-garnet-epidote skarn associated commonly with chalcopyrite. Both miharaite and wittichenite occur both as separate grains and also associated with chalcopyrite and/or galena as small granules or drops (10-30 microns) in the bornite, and sometimes along grain boundaries of bornite as stringers or chains of drops. It is suggested that wittichenite, as well as chalcopyrite, is probably a product of exsolution from a bornite solid solution stable at high temperature. Miharaite occurs only microscopically, generally several tens of microns in size but up to 0.3 mm, as tiny granular drop-like shapes or irregular masses, closely associated with chalcopyrite, galena and sometimes wittichenite (AM 65.784-788).
At the Imooka mine, Kagamino-cho, Tomata District, Okayama Prefecture, Japan, miharaite occurs in a mineralised quartz vein through granite (HOM).
At the Ulsan Mine, Buk District, Ulsan, South Korea, miharaite occurs in a bornite vein in copper skarn ore (HOM).
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