igneous
Weathered granite (probable)
Granite; mainly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled gray-brown rock with visible pale feldspar/quartz and dark mica or weathering products; vitreous to dull luster, massive texture, no obvious cleavage as a whole, Mohs hardness about 6–7, specific gravity roughly 2.6–2.7.
Identified More igneous →
Explore Weathered granite (probable) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse-grained, mottled gray-brown rock with visible pale feldspar/quartz and dark mica or weathering products; vitreous to dull luster, massive texture, no obvious cleavage as a whole, Mohs hardness about 6–7, specific gravity roughly 2.6–2.7.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic continental plutonism; the brown surface reflects oxidation and weathering.
Uses & applications
Widely used as dimension stone, countertops, paving, monuments, aggregate, and landscaping rock; this rough specimen has little commercial value unless locality or texture is unusual.
Geological facts
Granite is identified by interlocking visible crystals rather than layers or vesicles. Exact identification would benefit from a fresh surface, hand lens, streak, and acid testing.
Field identification & locations
Common worldwide, especially in continental shields and mountain belts. Look for quartz’s glassy gray grains, pink/white feldspar, and black mica; it should not fizz with dilute hydrochloric acid.
