igneous
Mica-rich granite or pegmatite fragment
Feldspar–quartz rock with dark mica, likely biotite; exact identification is uncertain from the photo
AI-generated identification · may be incorrectCoarse, uneven grains with pale feldspar/quartz and a dark, possibly mica-rich patch. Hardness is likely around 6–7 for quartz and feldspar; mica is softer (2–3), with a vitreous-to-pearly luster and mica’s sheet-like cleavage.
Identified More igneous →
Explore Mica-rich granite or pegmatite fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, uneven grains with pale feldspar/quartz and a dark, possibly mica-rich patch. Hardness is likely around 6–7 for quartz and feldspar; mica is softer (2–3), with a vitreous-to-pearly luster and mica’s sheet-like cleavage.
Formation & geological history
Likely crystallized slowly from silica-rich magma, allowing visible mineral grains to form. No specific geological age or setting can be determined from the image.
Uses & applications
Granite is widely used as crushed stone, building stone, and countertops; this small, unverified fragment is mainly of educational or modest collector interest.
Geological facts
Granite commonly contains quartz, feldspar, and mica, but the dark area could also be surface staining or another mineral. A fresh, close view or simple mineral tests would improve identification.
Field identification & locations
Look for interlocking grains and glassy quartz alongside feldspar and dark mica; mica may split into thin flakes. Similar rocks occur in continental igneous bodies worldwide.
