mineral

Milky quartz vein fragment (likely quartz with minor feldspar/mica)

Quartz, SiO₂; possibly associated feldspar and mica

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous to pearly luster, massive/fibrous-looking texture, no true cleavage, conchoidal fracture, specific gravity about 2.65. The layered appearance may reflect quartz growth, fractures, or weathered host rock rather than a distinct mineral species.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich hydrothermal fluids crystallized in fractures, commonly during cooling of igneous or metamorphic rocks; the specimen’s exact geological age and locality cannot be determined from the image.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive translucent pieces are sold as cabinet specimens or occasionally cut and polished.

Geological facts

Milky quartz is cloudy because microscopic fluid inclusions and structural defects scatter light. Iron staining or small sulfide inclusions may account for the tan and dark patches.

Field identification & locations

Identify by its glassy translucence, high hardness, lack of cleavage, and inability to scratch it with a steel knife; a streak test should be white. Common worldwide, especially in hydrothermal veins and pegmatites.