igneous
Weathered granite fragment
Granite, principally quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, speckled cream-gray rock with visible pale feldspar, translucent quartz, and dark biotite/hornblende; typically Mohs 6–7, vitreous to dull luster, no prominent cleavage as a whole, and specific gravity about 2.6–2.7.
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Physical properties
Coarse-grained, speckled cream-gray rock with visible pale feldspar, translucent quartz, and dark biotite/hornblende; typically Mohs 6–7, vitreous to dull luster, no prominent cleavage as a whole, and specific gravity about 2.6–2.7.
Formation & geological history
Granite is intrusive igneous rock formed by slow cooling of silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events. The rounded shape and dull surface indicate abrasion and weathering.
Uses & applications
Used widely as dimension stone, building aggregate, paving, countertops, monuments, and landscaping stone; this small fragment has negligible commercial value.
Geological facts
Its coarse texture records slow underground cooling, allowing large interlocking crystals to grow. The exact specimen could also be granodiorite or another granitoid, which requires a fresh surface or laboratory analysis for confident distinction.
Field identification & locations
Look for interlocking light quartz and feldspar crystals with scattered dark mica or amphibole; it is commonly found in glacial deposits, stream gravel, road aggregate, and exposed continental batholiths. A hand lens and fresh fracture help separate it from finer-grained volcanic rocks.
