metamorphic

Quartz-bearing metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining

AI-generated identification · may be incorrect

White to gray, massive, sugary crystalline texture with rusty staining; vitreous to dull luster, no obvious cleavage, and likely Mohs hardness about 7. Quartzite is generally dense, tough, and scratches glass.

Identified September 11, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone recrystallized under heat and pressure during regional metamorphism; its precise geological age cannot be determined from the image and depends on its source terrane.

Uses & applications

Used as crushed stone, aggregate, road material, building stone, and decorative slabs; attractive specimens may be collected, though this example appears common.

Geological facts

The dark gray rind may represent mica-rich schist, gneiss, or weathered host rock enclosing a quartz-rich vein or layer, so it could also be a quartz vein in metamorphic rock rather than pure quartzite.

Field identification & locations

Look for interlocking quartz grains, strong resistance to scratching, and lack of acid reaction; a glassy fracture and translucent edges support abundant quartz. Common in metamorphic mountain belts worldwide.