igneous
Granite (likely weathered, mica-rich granite)
Granite, a coarse-grained quartz–feldspar intrusive igneous rock
AI-generated identification · may be incorrectVisible pale quartz/feldspar grains and dark, reflective mica or other mafic minerals; typically hardness 6–7, vitreous to dull luster, interlocking crystals, and no cleavage as a whole rock. The image alone does not allow definitive mineral identification.
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Physical properties
Visible pale quartz/feldspar grains and dark, reflective mica or other mafic minerals; typically hardness 6–7, vitreous to dull luster, interlocking crystals, and no cleavage as a whole rock. The image alone does not allow definitive mineral identification.
Formation & geological history
Forms when silica-rich magma cools slowly underground, commonly in continental crust; its age varies widely, from Archean to recent geological periods.
Uses & applications
Granite is widely used as building and paving stone, countertops, monuments, and decorative aggregate; this small rough piece is mainly a teaching or collector specimen.
Geological facts
Its speckled appearance comes from minerals crystallizing together during slow cooling; weathering can roughen the surface and alter feldspar or mica.
Field identification & locations
Look for interlocking, visible grains of quartz, feldspar, and dark mica, unlike layered or vesicular rocks. Granite occurs worldwide in continental plutons and mountain belts.
