mineral

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Usually white to translucent with a vitreous-to-waxy luster, uneven to conchoidal fracture, and no cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The specimen appears weathered and may contain minor inclusions or surface staining.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; quartz is common from Precambrian terrains through modern deposits. Its exact age cannot be determined from the image.

Uses & applications

Used in glass, ceramics, abrasives, engineered stone, electronics, and construction aggregate; attractive pieces are collected but this fragment has little gem value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, making it common in sand and sediment.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; common worldwide, especially in hydrothermal veins and granitic regions.