mineral

Quartz Druzy on Geode Fragment

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Clear to milky white; Luster: Vitreous (glassy) to adamantine on crystal faces; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Clear to milky white
Luster: Vitreous (glassy) to adamantine on crystal faces

Identified February 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed by the precipitation of silica-rich hydrothermal fluids within cavities or vesicles of volcanic rock or sedimentary limestone. Crystals grow inward from the cavity walls over thousands of years.

Uses & applications

Commonly used in jewelry (as 'druzy' pendants), home decor, and as entry-level specimen collecting. Industrial quartz is used in electronics and glass-making.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The term 'druzy' refers to a coating of fine crystals on a rock surface that resemble sugar or snow.

Field identification & locations

Identify in the field by its ability to scratch glass and its sugary, sparkling crystalline surface. Commonly found in riverbeds, volcanic regions, and limestone quarries globally.

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