mineral

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Clear to milky white with minor iron staining (yellowish/orange); Luster: Vitreous (glassy); Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Luster: Vitreous (glassy)

Identified March 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids precipitating in cavities of a host rock (likely basalt or limestone). This specimen displays a 'druzy' habit, where a layer of tiny crystals grows over a rock surface. Formation can occur across any geological age from Pre-Cambrian to Holocene.

Uses & applications

Used primarily for decorative purposes, crystal healing/metaphysical collections, and as mineral specimens. Industrial quartz is used in electronics (oscillators), glass making, and abrasives.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The term 'druzy' refers to the coating of fine crystals that look like sugar or glitter. Some of the world's most famous geodes and druzy specimens come from Brazil and Uruguay.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), glassy luster, and the presence of hexagonal crystal points. Often found in volcanic vugs or sedimentary geodes. Common in regions with high tectonic or volcanic history.