mineral

Milky quartz (massive quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster with irregular fracture; Mohs hardness 7, no cleavage, trigonal crystal structure, specific gravity about 2.65. The rounded form appears naturally water-worn or possibly polished/tumbled.

Identified September 2, 2026More mineral →

Explore Milky quartz (massive quartz) 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 fluids fill fractures or cavities, commonly in hydrothermal veins and igneous/metamorphic rocks; quartz is geologically widespread and may range from Precambrian to modern. The reported central Philippine locality is compatible with quartz-bearing volcanic and hydrothermal terrains.

Uses & applications

Used for glass, ceramics, abrasives, engineered stone, and electronics; attractive translucent pieces are sold as lapidary or decorative specimens. This specimen has modest jewelry/collector value unless unusually clear or well-shaped.

Geological facts

Milky appearance is caused by microscopic fluid inclusions, fractures, or defects scattering light. It should scratch ordinary glass, while a steel knife generally will not scratch it.

Field identification & locations

Identify by its hardness, lack of cleavage, curved/irregular fracture, and translucent white appearance; calcite would be softer and fizz in dilute acid. Common worldwide in quartz veins, including volcanic regions of the Philippines.