mineral

Blue Quartz (Dumortierite Quartz)

Silicon Dioxide (SiO2) with Dumortierite inclusion [Al7BO3(SiO4)3O3]

Hardness: 7 on Mohs scale. Color: Muted denim blue to greyish-blue with subtle fibrous streaks or milky translucency. Luster: Vitreous to waxy when polished. Crystal Structure: Hexagonal (trigonal). Specific Gravity: 2.65 - 2.85.

Hardness: 7 on Mohs scale
Luster: Vitreous to waxy when polished

Identified July 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-rich hydrothermal veins or high-grade metamorphic environments where quartz crystallizes along with trace amounts of dumortierite, a aluminum borosilicate mineral that imparts the characteristic blue hue.

Uses & applications

Used primarily in jewelry, cabochons, polished tumbled stones, decorative carvings, and mineral collections. Highly valued in metaphysical and crystal healing practices.

Geological facts

Unlike blue chalcedony or aquamarine, blue quartz owes its color to microscopic inclusions of fibrous dumortierite or tourmaline rather than trace elements substitution in the crystal lattice itself.

Field identification & locations

Identified by its distinctive denim-blue color combined with typical quartz hardness (scratches glass easily). Found in Brazil, Madagascar, South Africa, India, and the United States. Tumbled stones are easy to care for and durable.

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