Clear Quartz

Physical Properties

Hardness: 7 Mohs; Color: Colorless (clear); Luster: Vitreous (glassy); Crystal Structure: Hexagonal (Trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Formation & Geological History

Formed through the crystallization of silica-rich magma or precipitation from hydrothermal veins. It is found in all types of geological environments (igneous, metamorphic, and sedimentary) across all geological ages.

Uses & Applications

Extensively used in jewelry and lapidary arts as beads and cabochons. Industrially, it is used in glassmaking, electronics (piezoelectric properties), and timekeeping components.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which originally meant 'hard'. Clear quartz is often referred to as 'Rock Crystal'.

Field Identification & Locations

Identify in the field by its hardness (scratches glass), lack of true cleavage, and characteristic conchoidal (shell-like) fracture. Found globally, especially in mountain ranges and riverbeds.

Identified on: 4/21/2026

Mode: Standard