mineral

Druzy quartz-bearing rock

Quartz, SiO₂, as a druse coating or quartz-rich vein material

AI-generated identification · may be incorrect

Colorless to gray, translucent microcrystals with vitreous luster; quartz hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure. The matrix appears dark gray and may include chalcedony or other silicate minerals.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill cavities, fractures, or vugs and precipitate numerous tiny quartz crystals, commonly in volcanic or hydrothermal environments. The specimen’s exact geological age and host rock cannot be determined from the image.

Uses & applications

Used as a decorative and lapidary material in specimens, cabochons, bookends, and jewelry; quartz is also important industrially in glass, electronics, and abrasives.

Geological facts

The sparkling surface is called druzy or druse, produced by densely packed crystal tips rather than metallic glitter. Individual quartz crystals may show six-sided prisms under magnification.

Field identification & locations

Identify by its glassy sparkle, abundant tiny crystals, hardness sufficient to scratch glass, and lack of cleavage; common sources include Brazil, Uruguay, Morocco, Mexico, and the United States. A streak or acid test is generally unnecessary.