igneous
Unakite-like granite with a white feldspar inclusion
Granite, chiefly quartz–feldspar–biotite; pale inclusion likely albite/orthoclase feldspar
AI-generated identification · may be incorrectCoarse-grained, dark gray to black matrix with abundant salmon-pink feldspar and a contrasting white, granular inclusion. Feldspar hardness is about Mohs 6, quartz 7; luster is generally vitreous to pearly, with no obvious cleavage visible in the photograph.
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Physical properties
Coarse-grained, dark gray to black matrix with abundant salmon-pink feldspar and a contrasting white, granular inclusion. Feldspar hardness is about Mohs 6, quartz 7; luster is generally vitreous to pearly, with no obvious cleavage visible in the photograph.
Formation & geological history
A slowly cooled intrusive igneous rock, likely Precambrian to Paleozoic in age; the pink crystals formed from potassium feldspar during granite crystallization. The white piece may be a feldspar-rich xenolith or later vein/inclusion.
Uses & applications
Used as dimension stone, countertops, architectural facing, monuments, and aggregate; attractive polished pieces are collected as decorative stone, though this specimen has limited gem value.
Geological facts
The mottled pink-and-black appearance resembles rapakivi or porphyritic granite rather than classic green-and-pink unakite. Exact identification requires a fresh surface, grain inspection, and tests for hardness and cleavage.
Field identification & locations
Common in continental crust and granite quarries worldwide, especially India, Brazil, Scandinavia, and North America. Look for interlocking crystals, pink feldspar, gray quartz, and black mica; avoid mistaking polished engineered stone for natural granite.
