Quartz (Milky or Common Quartz)

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed in igneous, metamorphic, and sedimentary environments. It frequently crystallizes from cooling magma or precipitates from hydrothermal veins. It is one of the most stable and abundant minerals on Earth.

Uses & Applications

Used in glass manufacturing, electronics (due to piezoelectric properties), abrasives, construction sand, and as a gemstones for jewelry and lapidary work.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is colorless, but minute fluid or gas inclusions give 'Milky Quartz' its characteristic snowy appearance.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass), lacks cleavage, and often shows a characteristic curved (conchoidal) fracture pattern when broken. It is found globally in almost all geological settings.

Identified on: 4/15/2026

Mode: Standard