mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-greasy luster; hardness 7 Mohs, no cleavage, and uneven to conchoidal fracture. Crystalline quartz is trigonal, though individual crystals are not visible here.

Identified October 10, 2026More mineral →

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Physical properties

White to translucent, vitreous-to-greasy luster; hardness 7 Mohs, no cleavage, and uneven to conchoidal fracture. Crystalline quartz is trigonal, though individual crystals are not visible here.

Formation & geological history

Likely a massive quartz fragment formed when silica-rich fluids filled fractures and crystallized, or as quartz in an igneous or metamorphic vein. Quartz is common in rocks of many geological ages; the specimen’s age and precise origin cannot be determined from the photo.

Uses & applications

Used as a silica source in glassmaking and industrial applications; attractive pieces are collected or occasionally cut and polished.

Geological facts

Milky appearance comes from tiny fluid or gas inclusions that scatter light.

Field identification & locations

Its white color, glassy sheen, hardness, and lack of cleavage are characteristic; it scratches glass and is found worldwide in veins and many rock types. This rough, hand-sized specimen appears common rather than gem-grade.