mineral
Druzy Quartz (Botryoidal)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 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 More 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.
