igneous
Granite
Granite, a coarse-grained intrusive felsic igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectPale tan and cream with visible interlocking grains and scattered dark minerals; typically Mohs 6–7, vitreous to dull, with no regular cleavage at the rock scale. The image suggests a feldspar-rich granite, though the specimen is too small and indistinct for a confident exact identification.
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Physical properties
Pale tan and cream with visible interlocking grains and scattered dark minerals; typically Mohs 6–7, vitreous to dull, with no regular cleavage at the rock scale. The image suggests a feldspar-rich granite, though the specimen is too small and indistinct for a confident exact identification.
Formation & geological history
Forms when silica-rich magma cools slowly beneath Earth’s surface, allowing large crystals to grow. Granite occurs in continental crust of many ages, from ancient Precambrian bodies to younger intrusions.
Uses & applications
Commonly used as building and paving stone, countertops, monuments, and decorative aggregate; suitable pieces may be collected as specimens.
Geological facts
Granite’s visible grains record slow underground cooling; its exact mineral proportions and name can vary substantially.
Field identification & locations
Look for interlocking light-colored feldspar and quartz grains with small dark mica or amphibole flecks; common in continental mountain belts and exposed plutons. A rough, fist-sized specimen like this is usually worth about $1–$10.
