mineral

Quartz Druzy

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Clear to white. Luster: Vitreous to sparkling. Crystal system: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Clear to white
Luster: Vitreous to sparkling

Identified July 15, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: Clear to white. Luster: Vitreous to sparkling. Crystal system: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Formation & geological history

Druzy quartz forms when mineral-rich water solutions cool or evaporate within rock cavities (vugs), allowing a layer of tiny crystals to grow on a host rock surface. This is common in volcanic and sedimentary environments.

Uses & applications

Primarily used in jewelry (pendants and rings) and as decorative mineral specimens for collectors. In industry, quartz is used in electronics and glass manufacturing.

Geological facts

The term 'druzy' refers specifically to the coating of fine crystals on a rock surface. Quartz is the most abundant mineral in the Earth's continental crust. These specimens are often called 'sparkle stones' by amateur collectors.

Field identification & locations

Identified by the distinct 'glitter' or sugary surface texture that reflects light. It can be found globally, frequently in geodes or limestone pockets. Collectors should look for even crystal coverage and absence of damage to the tiny points.