igneous
Likely pink granite or granitic gneiss pebble
Granite: quartz + alkali feldspar + plagioclase + biotite/hornblende; possibly weathered gneiss
AI-generated identification · may be incorrectPale pink-and-gray, coarse crystalline texture with dark mafic grains; likely Mohs 6–7, vitreous quartz and feldspar luster, no obvious cleavage on the rounded surface, specific gravity about 2.6–2.7.
Identified More igneous →
Explore Likely pink granite or granitic gneiss pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Pale pink-and-gray, coarse crystalline texture with dark mafic grains; likely Mohs 6–7, vitreous quartz and feldspar luster, no obvious cleavage on the rounded surface, specific gravity about 2.6–2.7.
Formation & geological history
Formed by slow cooling of silica-rich magma deep underground; granitic rocks are generally Precambrian to Paleozoic in age, then exposed and rounded by weathering and glacial/stream transport.
Uses & applications
Used as crushed stone, building and monument stone, countertops, and landscaping aggregate; this small rounded piece has little commercial value.
Geological facts
The pink color typically comes from potassium feldspar, while black flecks are biotite or amphibole. Its rounded form is consistent with glacially transported or stream-worn material.
Field identification & locations
Common and geologically plausible near 43.0°N, 77.1°W, where glacial deposits can contain Canadian Shield-derived granitic rocks. A fresh broken surface, hand lens, and streak/acid tests can distinguish it from pink rhyolite or quartz-rich conglomerate.
