mineral

Quartz Druze (on Matrix)

Silicon Dioxide (SiO2)

Hardness: 7.0 Mohs scale; Color: Clear to milky white; Luster: Vitreous (glassy); Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7
Color: Clear to milky white
Luster: Vitreous (glassy)

Identified March 21, 2026More mineral →

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Physical properties

Hardness: 7.0 Mohs scale; Color: Clear to milky white; Luster: Vitreous (glassy); Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through hydrothermal precipitation where silica-rich fluids fill cavities or fractures in host rock. As the fluid cools, tiny crystals grow on the surface, creating a 'druzy' texture. These can form in various geological ages, often in volcanic or sedimentary environments.

Uses & applications

Used primarily in jewelry (pendants and beads), metaphysical collecting, and as decorative mineral specimens. Quartz more broadly is used in electronics and glass manufacturing.

Geological facts

The word 'druzy' refers to a coating of fine crystals on a rock fracture or individual crystal; it originates from the German word 'druse,' meaning 'crystal cluster.' Many druzy quartz specimens are dyed to enhance their colors for the jewelry market.

Field identification & locations

Identify by its 'sparkling sugar' appearance under light and the hardness (it will scratch glass). Commonly found in geodes, vugs, and veins worldwide, notably in Brazil, the USA (Arizona), and India. Collectors look for uniform crystal coverage and absence of damage to the tiny points.