igneous
Granite (likely)
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectThe specimen is mottled gray, tan, and dark-colored with visible interlocking grains and a dull, granular surface. Likely minerals have Mohs hardness around 6–7 (quartz) and 6 (feldspar); exact composition and specific gravity cannot be determined from the photo.
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Physical properties
The specimen is mottled gray, tan, and dark-colored with visible interlocking grains and a dull, granular surface. Likely minerals have Mohs hardness around 6–7 (quartz) and 6 (feldspar); exact composition and specific gravity cannot be determined from the photo.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing crystals to grow. Its age depends on the source; granites occur in crust formed across much of Earth’s geological history.
Uses & applications
Granite is widely used as building and paving stone, countertops, monuments, and aggregate; this small rough piece is mainly suitable for collecting.
Geological facts
Granite’s visible speckled appearance results from intergrown mineral crystals, commonly including pink or white feldspar, translucent quartz, and dark mica or amphibole.
Field identification & locations
The hand-sized, speckled fragment is consistent with granite, though a photo cannot rule out another coarse-grained igneous rock. Granite is common in continental crust and exposed in many mountain ranges; a hand lens can reveal its individual crystals.
