igneous
Quartz-rich granitic rock, possibly pegmatite
Granite/pegmatitic granite; chiefly quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectCoarse, irregular interlocking grains with pinkish feldspar, gray-white quartz, and dark mica or alteration minerals; hardness about 6–7, vitreous quartz luster, no obvious cleavage in quartz, and feldspar cleavage. Exact identification is limited by the photograph and surface weathering.
Identified More igneous →
Explore Quartz-rich granitic rock, possibly pegmatite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, irregular interlocking grains with pinkish feldspar, gray-white quartz, and dark mica or alteration minerals; hardness about 6–7, vitreous quartz luster, no obvious cleavage in quartz, and feldspar cleavage. Exact identification is limited by the photograph and surface weathering.
Formation & geological history
Likely a slowly cooled intrusive igneous rock formed deep in continental crust, commonly Paleozoic to Precambrian in age; weathering has roughened and stained the exposed surface.
Uses & applications
Used as building and dimension stone, aggregate, countertops, and decorative material; this small specimen has mainly educational or modest collecting value.
Geological facts
The pink color commonly comes from potassium feldspar, while silvery or dark flakes may be mica. Greenish patches could represent chlorite or other secondary alteration minerals.
Field identification & locations
Look for visible quartz, feldspar, and mica grains and a massive, non-layered texture; common worldwide in continental mountain belts and granite quarries. A streak, hardness, and acid test would improve identification.
