Quartz (Crystal Point/Fragment)

Physical Properties

Hardness: 7 (Mohs scale), Color: Colorless to white/brown (translucent), Luster: Vitreous (glassy), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Formed in hydrothermal veins, pegmatites, and as a primary mineral in many igneous rocks. It can form at nearly any geological temperature or pressure and is found in deposits dating from the Archean to the present day.

Uses & Applications

Used in glass manufacturing, electronics (due to piezoelectric properties), abrasives, and widely collected as gemstones or decorative specimens.

Geological Facts

Quartz is one of the most abundant minerals in Earth's continental crust. It is highly resistant to both chemical and physical weathering, which is why it often makes up the majority of sand on beaches.

Field Identification & Locations

Identify in the field by its hardness (it scratches glass easily), glassy luster, and lack of cleavage (it breaks in curved, shell-like patterns). Very common in mountain ranges and river sediments.

Identified on: 4/28/2026

Mode: Standard