igneous
Red weathered granite boulder
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectReddish-pink with visible pale feldspar, gray quartz, and dark minerals; interlocking crystals, generally no cleavage as a rock. Typical minerals have Mohs hardness about 6–7; granite density is roughly 2.6–2.7 g/cm³, with a mostly vitreous-to-dull luster.
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Physical properties
Reddish-pink with visible pale feldspar, gray quartz, and dark minerals; interlocking crystals, generally no cleavage as a rock. Typical minerals have Mohs hardness about 6–7; granite density is roughly 2.6–2.7 g/cm³, with a mostly vitreous-to-dull luster.
Formation & geological history
Formed by slow cooling of silica-rich magma deep in the crust, allowing large crystals to grow. Its exact age and location cannot be determined from the photograph; granites occur in continental crust of many geological ages.
Uses & applications
Granite is used for building stone, paving, countertops, monuments, and crushed aggregate; this weathered specimen is mainly suitable for collecting or landscaping.
Geological facts
The red color commonly comes from iron-bearing potassium feldspar, while quartz appears gray or glassy and biotite or amphibole appears dark.
Field identification & locations
The coarse, interlocking grains and mixture of pink, gray, and black minerals are typical of granite. The image shows a weathered boulder among loose gravel, but does not establish its source locality.
