mineral

Quartz Druse (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Clear to milky white/grey crystals. Luster: Vitreous (glassy) on crystal faces, waxy on the outer rind. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Clear to milky white/grey crystals
Luster: Vitreous (glassy) on crystal faces, waxy on the outer rind

Identified March 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed via secondary precipitation from silica-rich groundwater filling cavities (vugs) within volcanic rock or sedimentary limestone. These often occur as geode fragments where crystals grow inward toward a central hollow. Geological age can range from Cenozoic to Paleozoic depending on the host rock.

Uses & applications

Commonly used for ornamental purposes, metaphysical collecting, and as a raw source of silica for industrial electronics or glass-making if found in massive quantities. Small specimens are popular introductory pieces for rock collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Small crystal clusters like this are referred to as 'druse' or 'drusy quartz,' which comes from the German word 'druse,' meaning a cavity or crystallized cluster.

Field identification & locations

Identify in the field by its hardness (it will easily scratch glass) and its crystalline habit. Look for vugs in basalt or limestone outcrops. Collectors should look for a hard, weather-resistant outer rind with sparking interior crystals.

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