mineral

Quartz Druze on Matrix (Geode Fragment)

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Clear to milky white crystals; Luster: Vitreous (glassy); Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Clear to milky white crystals
Luster: Vitreous (glassy)

Identified March 20, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Clear to milky white crystals; Luster: Vitreous (glassy); Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Formed by the precipitation of silica from hydrothermal fluids or groundwater within cavities (vugs) found in igneous or sedimentary rocks. The surrounding matrix often suggests a limestone or basaltic host rock. These range from millions to hundreds of millions of years in age.

Uses & applications

Predominantly used as decorative display pieces, in lapidary work for jewelry (cabochons or rough pendants), and as metaphysical 'healing' stones. Industrial quartz is used in glassmaking and electronics (piezoelectric properties).

Geological facts

This specimen is a fragment of a geode. The term 'druze' refers to the tiny crystals that form a crust over a rock surface. Quartz is the second most abundant mineral in Earth's continental crust.

Field identification & locations

Identify in the field by its distinct crystal points, ability to scratch glass, and the presence of a weathered, rounded exterior shell. Common in 'Thunder Egg' locations or limestone quarries in regions like the Midwest USA, Brazil, and Morocco.

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