igneous
Quartz-bearing rock, possibly pegmatite
Likely quartz and feldspar with dark mica or other accessory minerals; exact rock type is uncertain from the image
AI-generated identification · may be incorrectSmall, rough, mottled white, gray, and tan specimen with glassy-looking grains and dark inclusions. Quartz has Mohs hardness 7 and no cleavage; feldspar is about 6–6.5 and commonly shows cleavage. Grain size and crystal structure cannot be confirmed from the photo.
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Physical properties
Small, rough, mottled white, gray, and tan specimen with glassy-looking grains and dark inclusions. Quartz has Mohs hardness 7 and no cleavage; feldspar is about 6–6.5 and commonly shows cleavage. Grain size and crystal structure cannot be confirmed from the photo.
Formation & geological history
Could have formed as a slowly cooled, silica-rich igneous rock or vein material; geological age and setting cannot be determined visually.
Uses & applications
Common quartz–feldspar rocks are used as building or decorative stone and are collected as specimens; this piece appears too small for practical construction use.
Geological facts
The visible contrasting grains suggest a mixture of minerals rather than a single crystal. A fresh broken surface or magnification would help identify the minerals more reliably.
Field identification & locations
Look for interlocking light-colored grains and dark flecks; hardness testing and examining cleavage can help distinguish quartz from feldspar. Similar rocks occur widely in granites and pegmatites worldwide.
