mineral

Milky quartz in dark host rock

Quartz (SiO₂), likely as a vein or vein fragment; host rock uncertain

AI-generated identification · may be incorrect

The specimen shows opaque white to cream quartz with a glassy-to-dull surface and a dark gray-black outer portion. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and conchoidal fracture; the dark material cannot be identified confidently from the image.

Identified October 1, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich fluids filled a fracture in pre-existing rock and quartz crystallized as the fluids cooled. Its geological age and host-rock type cannot be determined from appearance alone.

Uses & applications

Commonly collected as a specimen; quartz is also used in glass, abrasives, electronics, and engineered stone. This rough piece has no obvious gem or industrial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering. Its white color comes from light scattering by inclusions or microscopic defects.

Field identification & locations

Look for hardness sufficient to scratch glass and absence of cleavage; a fresh surface may show curved, shell-like fracture. The photo does not reveal a locality or allow reliable identification of the dark host.