mineral

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Clear to grayish-white; Luster: Vitreous to sparkling; Crystal Structure: Hexagonal (Trigonal); Cleavage: None; Specific Gravity: 2.65

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

Identified March 29, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Clear to grayish-white; Luster: Vitreous to sparkling; Crystal Structure: Hexagonal (Trigonal); Cleavage: None; Specific Gravity: 2.65

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids precipitate into cavities or over existing rock surfaces. These specimens can range from millions to hundreds of millions of years old, often found in geodes, vugs, or as coatings on host rocks like limestone or basalt.

Uses & applications

Primarily used in jewelry (as pendants or beads) and as decorative collection specimens. Industrial quartz is used in glassmaking and electronics, though druzy specimens are valued for aesthetics.

Geological facts

The word 'druzy' (or drusy) refers to the tiny glittering crystals that cover a host stone; the effect is often compared to sugar or snow. Famous high-quality druzy comes from the basalt fields of Brazil and Uruguay.

Field identification & locations

Identify by its 'sugar-like' sparkle and sandpaper texture. It will scratch glass but cannot be scratched by a steel knife. Commonly found in volcanic regions or limestone quarries. Collectors should look for clean, undamaged crystal faces.