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Sakhalin
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Sakhalin is a long and narrow island off the coast of Primorye. Geologically it is most interesting for it's oil reserves. The mineralogical information I currently have on Sakhalin is a bit sketchy. More information is welcome!
Not to be confused with Mys Schidta in Chukotka
mineralogy
Natrolite Pectolite
Svetlovsk is a mercury deposit.