mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Opaque white to pale cream, with a vitreous-to-dull luster and irregular fracture; quartz is Mohs hardness 7, has a trigonal crystal structure, no cleavage, and specific gravity about 2.65. The specimen appears to be a rough, massive piece rather than a distinct crystal.

Identified October 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins and fractures, and also occurs in igneous and metamorphic rocks. Quartz is widespread across many geological ages; the image cannot establish this specimen’s age or precise source.

Uses & applications

Common quartz is used in glassmaking, abrasives, engineered stone, and electronics; attractive pieces may be kept as inexpensive specimens.

Geological facts

Its cloudy appearance comes from microscopic fluid or gas inclusions and other defects that scatter light.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and a white streak; these help distinguish quartz from softer white minerals, though confirmation may require testing. Milky quartz occurs worldwide; estimated value is about $1–$10 for a small common rough piece.