mineral

Blue Quartz (Blue Chalcedony/Dumortierite Quartz)

Silicon Dioxide (SiO2) with inclusions (typically Dumortierite Al7(BO3)(SiO4)3O3)

AI-generated identification · may be incorrect

Hardness: 7 Mohs scale; Color: Pale to deep blue with golden-brown iron oxide veins; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.65

Hardness: 7 Mohs scale
Color: Pale to deep blue with golden-brown iron oxide veins
Luster: Vitreous to waxy

Identified June 21, 2026More mineral →

Explore Blue Quartz (Blue Chalcedony/Dumortierite Quartz) in the encyclopedia →

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Physical properties

Hardness: 7 Mohs scale; Color: Pale to deep blue with golden-brown iron oxide veins; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.65

Formation & geological history

Formed primarily through the crystallization of silica-rich hydrothermal fluids in igneous veins or as secondary deposits in sedimentary rock cavities. The blue color is often caused by micro-inclusions of other minerals like dumortierite or tourmaline.

Uses & applications

Used extensively in lapidary for carvings, cabochons, and polished pocket stones. It is popular in the metaphysical community and for jewelry such as pendants and bracelets.

Geological facts

Unlike Blue Lace Agate, Blue Quartz often gets its color from mineral inclusions rather than structural light scattering. It is sometimes referred to as 'Blue Moon Quartz' when it displays a specific translucency.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and the presence of fibrous or moss-like blue inclusions. Found commonly in Brazil, South Africa, and the United States (Virginia).