Marekanite

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marekanite [¦mär·ə¦ka‚nīt]

(geology)

Rounded to subangular obsidian bodies that occur in masses of perlite.

Marekanite

(named after the Marekanka River in the Sea of Okhotsk basin), a variety of rhyolitic volcanic glass which when struck breaks apart into characteristic small concentric botryoidal spheres that are iridescent on the surface. Marekanite consists of low-water obsidian inside and strongly hydrated glass (perlite) on the outside. Marekanite forms during incomplete secondary hydration of glass.

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