mineral

Quartz (Druzy) on Matrix

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: White to translucent with yellowish iron staining. Luster: Vitreous to crystalline. Crystal structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture).

Hardness: 7 on Mohs scale
Color: White to translucent with yellowish iron staining
Luster: Vitreous to crystalline

Identified July 6, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: White to translucent with yellowish iron staining. Luster: Vitreous to crystalline. Crystal structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture).

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in rock cavities or fractures. It is one of the most common minerals in the Earth's continental crust and can be found in virtually all geological environments.

Uses & applications

Quartz is used extensively in the glass industry, electronics (piezoelectric properties), and as decorative specimens or gemstones in jewelry.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. Its name is derived from the Greek word 'krustallos', meaning ice, because the ancients believed it was ice frozen so hard it would never melt.

Field identification & locations

Identify in the field by its hardness (will scratch glass) and lack of cleavage. Commonly found in veins within igneous or metamorphic host rocks. Collectors look for well-defined crystal terminations and clarity.