sedimentary

Druzy Quartz on Sandstone

Silicon Dioxide (SiO2) with Quartz Crystals on Clastic Sedimentary Rock

AI-generated identification · may be incorrect

Hardness: 7 (quartz crystals) on Mohs scale; Color: Tan, brown, and grey with sparkling clear/white crystals; Luster: Vitreous/sparkly (crystals) to earthy (matrix); Structure: Hexagonal crystals on a granular matrix; Specific Gravity: Approx 2.65

Hardness: 7 (quartz crystals) on Mohs scale
Color: Tan, brown, and grey with sparkling clear/white crystals
Luster: Vitreous/sparkly (crystals) to earthy (matrix)

Identified July 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of sand grains (sedimentary process) followed by hydrothermal activity or mineral-rich groundwater filling vugs and fractures, precipitating a 'druse' layer of tiny quartz crystals over millions of years.

Uses & applications

Primarily used as decorative specimens, for educational geology collections, and sometimes in metaphysical practices. The host rock (sandstone) is widely used in construction.

Geological facts

The term 'druzy' refers to a coating of fine crystals on a rock surface. These sparkling layers take thousands of years to grow as silica-saturated water slowly evaporates or cools within rock cavities.

Field identification & locations

Identify by looking for a 'sugar-like' sparkle on a rough, grainy rock surface. Often found in areas with sedimentary basin histories. Collectors value specimens with high luster and unbroken crystal coverage.