igneous
Unakite-like granite
Altered granite, chiefly quartz, feldspar, mica, and red garnet
AI-generated identification · may be incorrectLight gray-white, coarse crystalline, with scattered burgundy-red garnet and dark biotite/hornblende; typically vitreous quartz, pearly feldspar, Mohs hardness about 6–7, and no strong cleavage as a whole. The image appears more feldspar-rich and pale than classic green-and-pink unakite.
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Physical properties
Light gray-white, coarse crystalline, with scattered burgundy-red garnet and dark biotite/hornblende; typically vitreous quartz, pearly feldspar, Mohs hardness about 6–7, and no strong cleavage as a whole. The image appears more feldspar-rich and pale than classic green-and-pink unakite.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep in the crust, with later alteration producing the distinctive red garnet-bearing texture. Granite is generally Precambrian to Phanerozoic in age, depending on locality.
Uses & applications
Used as decorative dimension stone, countertops, tiles, aggregate, and polished cabochons or ornamental objects; uncommon pieces may interest collectors.
Geological facts
The red grains are likely almandine or spessartine garnet, while black grains are probably biotite or amphibole. Similar material is marketed under names such as garnet granite or red-speckled granite.
Field identification & locations
Identify it by interlocking visible crystals, abundant pale feldspar/quartz, and dispersed red garnets; a glassy luster and hardness distinguish it from concrete. Common in Precambrian shield regions and granite quarries worldwide.
