mineral
Milky quartz
Quartz (SiO₂), commonly called milky quartz
AI-generated identification · may be incorrectUsually white to translucent with a vitreous-to-greasy luster and no cleavage; Mohs hardness 7, specific gravity about 2.65, and trigonal crystal structure. The specimen appears massive and opaque, with possible iron-oxide staining.
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Physical properties
Usually white to translucent with a vitreous-to-greasy luster and no cleavage; Mohs hardness 7, specific gravity about 2.65, and trigonal crystal structure. The specimen appears massive and opaque, with possible iron-oxide staining.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and fractures, or during cooling of silica-rich igneous rocks. Quartz occurs in rocks of many ages; the image does not reveal its specific age or source.
Uses & applications
Used as a silica source in glassmaking and other industrial applications; attractive pieces are collected or used decoratively, though this specimen is not gem-quality.
Geological facts
Quartz is one of Earth’s most abundant minerals and resists weathering, so it commonly accumulates in gravel and rock piles.
Field identification & locations
The rounded, white, massive appearance is typical of vein quartz. It can be distinguished from calcite by its greater hardness: quartz scratches glass and does not fizz in dilute acid.
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