mineral

Quartz (Common or Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to pale pink/beige; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); SG: 2.65

Hardness: 7 on Mohs scale
Color: White to pale pink/beige
Luster: Vitreous to waxy

Identified May 4, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to pale pink/beige; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); SG: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specimen appears water-worn or weathered, common in riverbeds or glacial till. Quartz is found in almost all geological ages.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), construction aggregates (sand/gravel), and as a semi-precious gemstone in jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is colorless, but impurities create various colors like amethyst (purple) or rose quartz (pink).

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of cleavage planes. Found globally in almost any environment including beaches, mountains, and deserts.

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