mineral

Quartz vein in weathered host rock

Milky quartz (SiO₂), likely in a feldspathic or carbonate-rich matrix

AI-generated identification · may be incorrect

White to translucent quartz with vitreous luster and irregular fracture; hardness about Mohs 7, no cleavage, and specific gravity about 2.65. The beige, granular host appears strongly weathered; exact matrix minerals cannot be confirmed from the photo.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly precipitates from silica-rich hydrothermal fluids filling fractures in older igneous, metamorphic, or sedimentary rocks; age depends on its host formation. Common worldwide in veins, pegmatites, and fault zones.

Uses & applications

Used as a silica source for glass, ceramics, engineered stone, and industry; attractive specimens are collected but this piece appears mainly of modest educational value.

Geological facts

Quartz is one of Earth’s most abundant minerals and forms six-sided crystals when space permits, though vein quartz often appears massive or coarsely crystalline.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, and ability to scratch ordinary glass; a steel nail will not scratch it. Common localities include hydrothermal veins worldwide, especially Brazil, the United States, Madagascar, and Europe.