mineral

Quartz crystal cluster in matrix

Quartz (SiO₂), likely in a feldspar- and mica-bearing pegmatite

AI-generated identification · may be incorrect

Visible translucent to milky, glassy quartz crystals occur in a coarse, pale matrix with dark mica or other inclusions. Quartz is trigonal, Mohs hardness 7, has no cleavage and conchoidal fracture; exact specimen properties depend on the matrix minerals.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as silica-rich fluids crystallized slowly in a pegmatite or related vein; such deposits occur in many ages and regions. The photograph alone cannot establish a precise locality or age.

Uses & applications

Quartz is used in glass, electronics, abrasives, and ornamental specimens; attractive crystal clusters are collected and displayed.

Geological facts

Quartz commonly forms six-sided prisms with pointed terminations, though crystals here are partly embedded and broken or obscured.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch glass, and lack of cleavage; feldspar and mica in the matrix may help indicate pegmatite. Common worldwide in quartz veins and pegmatites.