Blue Quartz

Physical Properties

Hardness: 7 Mohs; Color: Pale blue to medium blue; Luster: Vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & Geological History

Formed in igneous and metamorphic environments. The blue color is often caused by inclusions of other minerals like magnesio-riebeckite, crocidolite, or tourmaline, or by the Rayleigh scattering of light.

Uses & Applications

Primarily used for lapidary purposes including jewelry (cabochons, beads), decorative carvings, and as a collector's stone or metaphysical crystal.

Geological Facts

Unlike Blue Chalcedony which is microcrystalline, Blue Quartz typically contains fibrous mineral inclusions that create its characteristic opaque to translucent blue appearance.

Field Identification & Locations

Identify by its hardness (scratches glass), lack of cleavage, and the presence of internal inclusions. Commonly found in Brazil, India, and the United States (Virginia).

Identified on: 5/10/2026

Mode: Standard