Clear Quartz (Rock Crystal)

Physical Properties

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

Formation & Geological History

Formed from molten silica cooling in igneous rocks or precipitated from hydrothermal veins in various geological environments; occurs in all ages of bedrock.

Uses & Applications

Used in electronics (oscillators), optical lenses, abrasive manufacturing, glassmaking, jewelry (as a gemstone), and metaphysical collections.

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'.

Field Identification & Locations

Look for hexagonal prism shapes with flat horizontal striations on the faces. It is distinguished from diamond by its lack of cleavage and from glass by its hardness (it scratches glass).

Identified on: 5/17/2026

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