igneous
Likely granite fragment
Granite, a coarse-grained rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectSmall, rough, mottled reddish-brown and gray fragment with visible granular crystals. Typical granite minerals have Mohs hardness around 6–7; the image alone does not confirm its exact composition or properties.
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Physical properties
Small, rough, mottled reddish-brown and gray fragment with visible granular crystals. Typical granite minerals have Mohs hardness around 6–7; the image alone does not confirm its exact composition or properties.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing crystals to grow. Its age depends on its source and cannot be determined from the image.
Uses & applications
Granite is widely used as building and paving stone, countertops, monuments, and decorative aggregate; this fragment is mainly of modest collecting interest.
Geological facts
The reddish color commonly comes from iron-bearing potassium feldspar, while glassy gray grains may be quartz.
Field identification & locations
Look for interlocking, visible grains of light feldspar or quartz with darker mica or other minerals. Similar granite occurs on continents worldwide; verify with a fresh surface and hardness tests.
