mineral

Milky quartz crystal cluster

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Colorless to milky-white, translucent, and glassy with uneven fracture; visible crystal faces appear typical of quartz. Hardness 7 Mohs, no cleavage, specific gravity about 2.65, trigonal crystal structure.

Identified September 4, 2026More mineral →

Explore Milky quartz crystal cluster in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or groundwater precipitate quartz in veins, cavities, and geodes. Quartz is common from Precambrian to modern geological settings; the specimen’s exact age cannot be determined visually.

Uses & applications

Used for glass, engineered stone, electronics, abrasives, and decorative specimens; attractive clusters have modest collector value.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Common worldwide, especially in hydrothermal veins and pegmatites. Field tests include scratching glass with an edge, lacking cleavage, and showing white streak; calcite would be softer and fizz in dilute acid. The image could also represent a quartz-rich feldspar or calcite piece, so confirmation requires testing.