mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; translucent to opaque white with a vitreous-to-greasy luster and no cleavage. Trigonal crystal structure, though this rough fragment shows no distinct crystal faces; specific gravity about 2.65.
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Physical properties
Hardness 7 Mohs; translucent to opaque white with a vitreous-to-greasy luster and no cleavage. Trigonal crystal structure, though this rough fragment shows no distinct crystal faces; specific gravity about 2.65.
Formation & geological history
Forms when silica-rich fluids crystallize in fractures and veins, or during cooling of silica-rich magma. Quartz is found in rocks of nearly all geological ages.
Uses & applications
Used in glassmaking, electronics, abrasives, and decorative objects; attractive pieces may be polished for jewelry or collecting.
Geological facts
Quartz is one of Earth’s most abundant minerals and can produce a piezoelectric response when mechanically stressed.
Field identification & locations
The white color and glassy sheen are consistent with milky quartz, but the image alone cannot confirm the identification. Common worldwide, including in veins and granite; value depends on size, clarity, and crystal form.
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