mineral

Quartz / Quartz Cluster

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless to grey/tan (based on image); Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless to grey/tan (based on image)
Luster: Vitreous (glassy)

Identified March 12, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the cooling of silica-rich magma or through hydrothermal precipitation in veins/cavities. It is found in all geological ages and environments, most commonly in igneous and metamorphic terrains.

Uses & applications

Used extensively in glass manufacturing, electronics (due to piezoelectric properties), construction as an abrasive, and widely in the jewelry and gemstone industry.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. It is highly resistant to both chemical and physical weathering, which is why it is the primary component of beach sand.

Field identification & locations

Identify in the field by its hardness (it will scratch glass and pocket knife blades) and lack of cleavage. Found globally in mountainous regions, riverbeds, and vugs. Collector tip: look for crystal faces to determine quality.