mineral

Milky quartz with dark mineral inclusions

Quartz, SiO₂; dark inclusions are not identifiable from the image

AI-generated identification · may be incorrect

Mostly white to translucent, vitreous quartz with irregular fracture and no obvious cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. Dark gray-brown patches may be other minerals or surface staining.

Identified September 28, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids in veins and pegmatites, or forms during metamorphism; its age and exact origin cannot be determined from the image.

Uses & applications

Quartz is used in glass, electronics, construction aggregate, and decorative or collectible specimens; this rough piece has limited jewelry value unless it contains attractive, identifiable inclusions.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly occurs in many different rock types.

Field identification & locations

Look for hardness near 7, glassy luster, and lack of cleavage; common worldwide in veins, granites, and metamorphic rocks. The dark material requires close examination or testing for identification.