mineral

Quartz-rich rock fragment, possibly milky quartz

Quartz (SiO₂), likely a small vein-quartz or quartz-bearing rock fragment

AI-generated identification · may be incorrect

White to gray, translucent patches, dull-to-glassy luster, and irregular fracture; quartz hardness is Mohs 7, with no cleavage and a hexagonal crystal structure. The image is insufficient to determine whether the specimen is pure quartz or quartzite/granite.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich hydrothermal fluids in veins, or occurs in igneous and metamorphic rocks; such material ranges from Precambrian to modern geological ages. Common settings include fractures, pegmatites, granite terrains, and metamorphic belts.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive clear or well-crystallized pieces are collected and occasionally used as gemstones. This small rough fragment has little commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Milky appearance usually results from microscopic fluid inclusions or fractures.

Field identification & locations

Look for hardness sufficient to scratch ordinary glass, lack of cleavage, and a white streak; vinegar is not diagnostic. Common worldwide, especially in quartz veins and granitic or metamorphic regions.