igneous
Coarse-grained granite
Granite, composed mainly of quartz, feldspar, and dark mica or amphibole
AI-generated identification · may be incorrectVisible interlocking grains with pink feldspar, gray quartz, and black minerals; typically Mohs 6–7, vitreous quartz and feldspar luster, no distinct cleavage as a whole, and specific gravity about 2.6–2.8.
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Physical properties
Visible interlocking grains with pink feldspar, gray quartz, and black minerals; typically Mohs 6–7, vitreous quartz and feldspar luster, no distinct cleavage as a whole, and specific gravity about 2.6–2.8.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, allowing large crystals to form. Specimen age cannot be determined from the image; granites occur across a wide range of geological ages.
Uses & applications
Used as dimension stone, paving, countertops, monuments, and aggregate; this rough specimen is mainly suitable for collecting or teaching.
Geological facts
The contrasting pink and black patches are typical of granitic rocks, though this specimen’s texture and mineral proportions are not fully clear from the photo.
Field identification & locations
Identify granite by its coarse, interlocking quartz and feldspar grains, commonly with dark mica or amphibole. It is widespread in continental mountain belts and exposed shield regions worldwide.
