igneous
Coarse-grained granite or granitic rock fragments
Granite; quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectLight gray to pinkish, speckled, and granular with visible interlocking crystals; likely Mohs hardness 6–7, vitreous quartz and pearly feldspar luster, poor cleavage as a whole, and specific gravity about 2.6–2.7.
Identified More igneous →
Explore Coarse-grained granite or granitic rock fragments in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Light gray to pinkish, speckled, and granular with visible interlocking crystals; likely Mohs hardness 6–7, vitreous quartz and pearly feldspar luster, poor cleavage as a whole, and specific gravity about 2.6–2.7.
Formation & geological history
A felsic intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic plutonic events. The pieces appear naturally fractured or broken from larger material.
Uses & applications
Widely used as dimension stone, countertops, paving, monuments, aggregate, and landscaping rock; these small fragments have little commercial or jewelry value.
Geological facts
Granite commonly contains quartz, potassium feldspar, plagioclase, and biotite or muscovite mica. Its large crystals indicate slow underground cooling rather than volcanic eruption.
Field identification & locations
Identify it by its coarse interlocking grains, pale color, and mixture of glassy quartz, blocky feldspar, and dark mica; acid testing should show no fizz. Common worldwide, especially in exposed continental crust and quarried areas.
