mineral

Milky quartz (rough quartz-rich rock)

Quartz, silicon dioxide (SiO₂); likely massive milky quartz, possibly quartzite

AI-generated identification · may be incorrect

White to translucent, dull-to-vitreous luster, granular/massive texture, and no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. The specimen’s weathered, uneven surface makes exact identification from an image uncertain.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids fill fractures or when quartz crystallizes in igneous and metamorphic rocks; quartz veins range from ancient Precambrian to geologically recent. If quartzite, it formed by metamorphism of quartz sandstone.

Uses & applications

Used for glass, ceramics, engineered stone, abrasives, and silicon production; attractive pieces are collected or used decoratively, though this rough specimen has little jewelry value.

Geological facts

Milky color results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many veins.

Field identification & locations

Likely quartz if it scratches ordinary glass and does not fizz in dilute acid; inspect for hexagonal crystal faces or a sugary fused-grain texture indicating quartzite. Common worldwide in quartz veins, pegmatites, and metamorphic terrains.