Rapakivi Granite (Wiborgite), viborgitic textureYour model is disabled. For more details go to Edit properties3D Model
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Locality: Ylämaa, Finland
Size: 12 x 6 x 2 cm
Type: Igneous intrusive (plutonic) rock
Description: The Rapakivi Granites are very odd, but very visually distinctive varieties of Granite. They are reported to have the same chemistry and mineralogy as ordinary Granites, but they are strongly porphyritic, and have large spheroidal K-Feldspar masses. This is a classical Baltic Brown Granite - a variety of Rapakivi Granite with viborgitic texture (called Wiborgite, ovoids with a rim of plagioclase).
Essential minerals: quartz, potassic feldspar (orthoclase, microcline), ± plagioclase, biotite.
Concept & 3D-modelling by dr. Andrei Ionut APOPEI