igneous
Weathered granitic rock (likely granite or granodiorite)
Granite–granodiorite; chiefly quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse, pale gray-green, granular texture with possible iron-oxide staining and weathering pits; quartz hardness 7, feldspar 6, mica 2–3, typically nonmetallic luster and no strong cleavage as a whole.
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Physical properties
Coarse, pale gray-green, granular texture with possible iron-oxide staining and weathering pits; quartz hardness 7, feldspar 6, mica 2–3, typically nonmetallic luster and no strong cleavage as a whole.
Formation & geological history
Slow cooling of silica-rich magma deep in the continental crust, producing interlocking crystals; commonly Mesozoic to Precambrian, though age cannot be determined from the photograph.
Uses & applications
Used as crushed aggregate, building stone, monuments, countertops, and landscaping material; this small weathered fragment has negligible commercial value.
Geological facts
Granite and granodiorite are plutonic igneous rocks whose visible crystals indicate slow underground cooling. Greenish coloration may reflect chlorite or epidote alteration rather than the primary rock composition.
Field identification & locations
Identify by its visibly interlocking quartz and feldspar grains, abundant pale minerals, and occasional dark mica or amphibole; common in continental mountain belts and glacial deposits. A hand lens, streak test, and fresh broken surface would improve identification.
