igneous
Likely weathered granite or granitic rock
Felsic intrusive igneous rock; quartz–alkali feldspar–plagioclase with biotite/hornblende
AI-generated identification · may be incorrectBrownish-red, granular and massive, with visible interlocking mineral grains and dull to slightly glassy luster. Typical hardness is about 6–7 Mohs; cleavage occurs in feldspar, while quartz has none; specific gravity is roughly 2.6–2.7.
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Physical properties
Brownish-red, granular and massive, with visible interlocking mineral grains and dull to slightly glassy luster. Typical hardness is about 6–7 Mohs; cleavage occurs in feldspar, while quartz has none; specific gravity is roughly 2.6–2.7.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep within Earth’s crust, commonly during Precambrian to Mesozoic continental mountain-building; surface oxidation and weathering produce the reddish-brown color.
Uses & applications
Used extensively as crushed stone, road aggregate, building stone, countertops, monuments, and landscaping material; this small weathered fragment has little gem value.
Geological facts
The reddish coloration commonly comes from iron oxidation in feldspar or biotite. Exact identification is limited by the small, weathered specimen and photograph.
Field identification & locations
Look for coarse interlocking quartz and feldspar grains, lack of layering or foliation, and a scratch resistance near steel. Common worldwide in continental shields, mountain belts, and exposed plutons.
