igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectPale cream-gray with visible light feldspar/quartz and dark mica or other mafic grains; rough, interlocking crystalline texture. Typical minerals have Mohs hardness about 6–7 (quartz) and 6 (feldspar); the specimen’s grain size and lighting limit precise identification.
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Physical properties
Pale cream-gray with visible light feldspar/quartz and dark mica or other mafic grains; rough, interlocking crystalline texture. Typical minerals have Mohs hardness about 6–7 (quartz) and 6 (feldspar); the specimen’s grain size and lighting limit precise identification.
Formation & geological history
Likely formed by slow cooling of silica-rich magma deep in continental crust, allowing visible crystals to grow. Granite bodies form across many geological ages; this hand specimen’s age and source cannot be determined from the image.
Uses & applications
Granite is widely used as building and dimension stone, countertops, paving, and aggregate; attractive pieces may be kept as teaching or collecting specimens.
Geological facts
Granite is defined by its mineral proportions and texture, and commonly contains quartz, potassium feldspar, plagioclase, and mica. The pictured sample appears granite-like, though a photo cannot confirm its exact composition.
Field identification & locations
Look for a coarse, speckled mix of interlocking crystals, including hard glassy quartz and feldspar; common sources include continental plutons and quarries worldwide. A streak, hardness, and fresh-surface examination would help distinguish related rocks.
