mineral

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless to white/translucent; Luster: Vitreous (glassy); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless to white/translucent
Luster: Vitreous (glassy)

Identified May 9, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless to white/translucent; Luster: Vitreous (glassy); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through the crystallization of magma or from hydrothermal veins. It is one of the most abundant minerals in the Earth's crust and can be found in igneous, metamorphic, and sedimentary environments.

Uses & applications

Used widely in glass making, electronics (due to piezoelectric properties), abrasives, grit for sandblasting, and as semi-precious gemstones in jewelry.

Geological facts

Quartz is highly resistant to both chemical and physical weathering. When rocks weather away, the leftover material is often quartz sand, which is why most beach sand is composed of this mineral.

Field identification & locations

Identify in the field by its hardness (it will scratch glass and steel), lack of cleavage, and glassy appearance. It is found globally, particularly in mountainous regions and riverbeds.