mineral

Quartz fragment

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous to greasy

Identified May 29, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed in various geological environments, most commonly from the cooling of magma in igneous rocks or through hydrothermal vein activity as water-rich fluids cool. Found in rocks of all ages.

Uses & applications

Large-scale use in glass making, electronics (due to piezoelectric properties), abrasives, and as a semi-precious gemstone in jewelry. Small fragments are common in construction sand.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to both chemical and physical weathering.

Field identification & locations

Identify by its hardness (it can scratch glass) and lack of cleavage. Commonly found in riverbeds, mountains, and as a primary component of granite. Small fragments like this are ubiquitous across the globe.