mineral

Drusy quartz on a matrix (tentative)

Quartz, SiO₂, as a fine-grained drusy coating; associated matrix is unclear from the image

AI-generated identification · may be incorrect

Quartz is Mohs 7, typically vitreous, with hexagonal crystal structure and no cleavage; the visible tiny reflective crystals appear pale to dark against a brown, possibly iron-stained matrix.

Identified October 14, 2026More mineral →

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Physical properties

Quartz is Mohs 7, typically vitreous, with hexagonal crystal structure and no cleavage; the visible tiny reflective crystals appear pale to dark against a brown, possibly iron-stained matrix.

Formation & geological history

Drusy quartz forms when silica-rich fluids precipitate many small crystals in a cavity or on a rock surface. The image does not allow the host rock or geological age to be determined.

Uses & applications

Drusy quartz is collected and used in decorative specimens and jewelry; value depends on crystal coverage, color, size, and condition.

Geological facts

The sparkling surface is characteristic of numerous small crystals rather than one large crystal.

Field identification & locations

Look for a carpet of tiny, pointed, glassy crystals; confirm quartz by its hardness and lack of cleavage. Drusy quartz occurs worldwide in geodes and mineralized cavities.