metamorphic

Quartz vein fragment (likely quartz with dark host rock)

Quartz (SiO₂) in an unidentified fine-grained host rock

AI-generated identification · may be incorrect

Appears to have cream-white, opaque to translucent quartz alongside dark gray-brown matrix; quartz hardness 7 Mohs, vitreous luster, hexagonal crystal system, and no cleavage. The host rock cannot be identified confidently from the small image.

Identified September 23, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartz commonly forms when silica-rich fluids fill fractures in older rocks, where it crystallizes as veins; the specimen’s age and exact formation setting are undetermined.

Uses & applications

Quartz-bearing rock is commonly collected; quartz is also used in glass, electronics, and construction, though this small fragment has no evident commercial use.

Geological facts

Quartz is among Earth’s most abundant minerals and often forms conspicuous veins cutting through host rock.

Field identification & locations

Look for hardness greater than glass and irregular, glassy fracture in the pale material; identifying the dark matrix requires a closer view and simple tests. Quartz veins occur in many rock types worldwide.