igneous
Weathered granite or granitic rock fragment
Granite; chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse, irregularly granular texture with tan-brown weathering, pale feldspar/quartz, and possible dark mica; hardness about 6–7 Mohs, vitreous to dull luster, no prominent cleavage as a rock, specific gravity roughly 2.6–2.7.
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Physical properties
Coarse, irregularly granular texture with tan-brown weathering, pale feldspar/quartz, and possible dark mica; hardness about 6–7 Mohs, vitreous to dull luster, no prominent cleavage as a rock, specific gravity roughly 2.6–2.7.
Formation & geological history
Formed when silica-rich magma slowly crystallized deep underground, producing interlocking crystals; likely Paleozoic to Precambrian in age depending on source, then exposed and weathered at the surface.
Uses & applications
Common granite is used for building stone, countertops, aggregate, monuments, and landscaping; an unattractive fragment has little commercial or collector value.
Geological facts
The brown coloration likely reflects oxidation of iron-bearing minerals or feldspar alteration rather than the original granite color.
Field identification & locations
Identify it by visible interlocking light crystals and granular texture; distinguish it from sandstone by its lack of rounded grains or bedding and from quartzite by its mixed feldspar/mica content. Common worldwide, especially in continental shields and mountain belts.
