igneous
Weathered granite or granitic gneiss
Felsic granitoid; primarily quartz, potassium feldspar, plagioclase, and mica
AI-generated identification · may be incorrectCoarse-grained, pinkish-brown and gray, with a granular texture and dull to slightly sparkly luster from mica. Typical hardness is about 6–7 Mohs; interlocking crystals show no consistent cleavage, and density is roughly 2.6–2.8 g/cm³.
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Physical properties
Coarse-grained, pinkish-brown and gray, with a granular texture and dull to slightly sparkly luster from mica. Typical hardness is about 6–7 Mohs; interlocking crystals show no consistent cleavage, and density is roughly 2.6–2.8 g/cm³.
Formation & geological history
Likely crystallized slowly from silica-rich magma deep within Earth, commonly during Precambrian to younger continental mountain-building events; the rounded surface reflects weathering and erosion. The image alone cannot reliably distinguish granite from strongly weathered granitic gneiss.
Uses & applications
Used extensively as building stone, aggregate, monuments, countertops, and decorative landscaping rock; this small weathered piece has mainly educational or modest collecting value.
Geological facts
Pink coloration commonly comes from potassium feldspar, while dark flecks are biotite or hornblende. Granite is one of the most abundant continental crustal rocks.
Field identification & locations
Identify it by visible interlocking pink/white feldspar, gray translucent quartz, and dark mica grains; a fresh broken surface is more diagnostic than the weathered exterior. Common worldwide, especially in continental shields and mountain belts.
