Baltic Brown
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05-163
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Rapakivi granite from the Precambrian of Finland. Baltic Brown Granite is a variety of rapakivi granite called wiborgite, characterized by having large K-feldspar spheroids rimmed (usually) by greenish plagioclase feldspar. Wiborgite is composed of K-feldspar, plagioclase feldspar, quartz, biotite mica, and hornblende amphibole. This rock comes from the Wiborg Batholith (a.k.a. Wiborg Rapakivi Granite Batholith, Wiborg Massif, Vyborg Batholith) in the Baltic Shield (Fennoscandian Shield).
Source: https://www.lustroitaliano.com/gallery-granite-stone-s/1912.htm
