mineral

Druzy Quartz (Botryoidal)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, grey, brownish-tan; Luster: Vitreous to dull; Crystal structure: Trigonal; Texture: Botryoidal (grape-like) or drusy crust.

Hardness: 7 (Mohs scale)
Color: White, grey, brownish-tan
Luster: Vitreous to dull

Identified July 15, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, grey, brownish-tan; Luster: Vitreous to dull; Crystal structure: Trigonal; Texture: Botryoidal (grape-like) or drusy crust.

Formation & geological history

Formed from silica-rich hydrothermal fluids precipitating in voids or cavities of volcanic or sedimentary rocks, often as coatings over earlier mineral structures.

Uses & applications

Primarily used as decorative display specimens, in lapidary work for unique jewelry pieces, and as a popular collector item.

Geological facts

This specific piece shows a 'druzy' coating of tiny crystals over a potentially chalcedonic or botryoidal base, giving it a cauliflower or jagged appearance. Such formations are common in geode-rich areas.

Field identification & locations

Identify by its ability to scratch glass (Hardness 7) and the presence of micro-crystalline surfaces. Commonly found in the Midwest US (like Keokuk geodes) or volcanic regions of Brazil and Uruguay.