igneous
Pink feldspar-bearing granite or pegmatitic rock
Granite/pegmatite, chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and dark mica/amphibole; pink areas may be K-feldspar or garnet.
AI-generated identification · may be incorrectCoarse, interlocking crystalline texture with gray, white, pink, and black grains; generally vitreous to pearly luster, no foliation, and poor cleavage as a whole. Hardness is about 6–7 Mohs; density commonly 2.6–2.8 g/cm³.
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Physical properties
Coarse, interlocking crystalline texture with gray, white, pink, and black grains; generally vitreous to pearly luster, no foliation, and poor cleavage as a whole. Hardness is about 6–7 Mohs; density commonly 2.6–2.8 g/cm³.
Formation & geological history
A silica-rich magma cooled slowly underground, allowing large crystals to form; the exact age cannot be determined from the photograph and may range from Precambrian to much younger depending on locality.
Uses & applications
Used as crushed stone, aggregate, building and decorative stone; attractive polished pieces are collected, though this rounded specimen has modest commercial value.
Geological facts
The pink component is likely potassium feldspar, but its coarse patches could also include garnet or altered minerals; a thin-section or chemical test is needed for certainty.
Field identification & locations
Identify by visible interlocking quartz, feldspar, and dark minerals, lack of layering, and resistance to scratching; common in continental shields, mountain belts, and granite outcrops worldwide.
