mineral

Druzy Quartz on Chert/Chalcedony

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White, clear, tan, and brownish-orange (iron staining); Luster: Vitreous to sparkling (druzy); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).

Hardness: 7 on Mohs scale
Color: White, clear, tan, and brownish-orange (iron staining)
Luster: Vitreous to sparkling (druzy)

Identified May 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the precipitation of silica-rich fluids in cavities or fractures within host rocks (often limestone or volcanic rock). The 'druzy' coating consists of tiny crystals that grew on a pre-existing mineral surface or chalcedony base.

Uses & applications

Primarily used for lapidary work, jewelry (pendants and beads), and as display specimens for collectors.

Geological facts

The term 'druzy' refers to a coating of fine crystals on a rock surface; it is from the German word 'druse', meaning a cluster of crystals in a rock cavity.

Field identification & locations

Identify by its 'sparkly' sugar-like appearance on a hard, dense base. It will scratch glass easily. Commonly found in riverbeds, gravel pits, and areas with limestone weathering.

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Mineral/Rock

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Metamorphic Rock

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mineral