mineral

Quartz vein specimen

Quartz (SiO₂), likely drusy or massive quartz on host rock

AI-generated identification · may be incorrect

White to translucent, vitreous-to-sparkling luster, irregular crystalline aggregates, and no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. Brown areas may be iron-oxide staining or attached host rock.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Quartz precipitated from silica-rich hydrothermal fluids in fractures, forming a vein or cavity coating; the exact geological age and host rock cannot be determined from the image. Commonly forms in igneous, metamorphic, and sedimentary environments.

Uses & applications

Used as silica for glass, ceramics, abrasives, and engineered stone; attractive crystal clusters are collected and occasionally used decoratively. This specimen has modest ornamental value unless crystals are unusually clear or well formed.

Geological facts

Quartz is one of Earth’s most abundant minerals and has strong piezoelectric properties. Drusy quartz consists of many tiny crystals coating a surface.

Field identification & locations

Identify it by its glassy sparkle, white/translucent color, lack of cleavage, and resistance to scratching; it should scratch window glass but not be scratched by a steel knife. Common localities include hydrothermal veins worldwide, including Brazil, Mexico, the United States, and Madagascar.