mineral
Blue Quartz (Dumortierite Quartz)
SiO2 with inclusion of AlAl6BSi3O18
Hardness: 7 (Mohs scale), Color: Sky blue to deep denim blue, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (Trigonal), Cleavage: None
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Physical properties
Hardness: 7 (Mohs scale), Color: Sky blue to deep denim blue, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (Trigonal), Cleavage: None
Formation & geological history
Forms in igneous and metamorphic environments, specifically in pegmatites and regionally metamorphosed rocks, where quartz incorporates fibrous dumortierite inclusions during crystallization.
Uses & applications
Primarily used for decorative purposes, lapidary work, tumbled stones, and metaphysical jewelry.
Geological facts
While pure quartz is clear, blue quartz gets its color from tiny inclusions of other minerals like dumortierite, magnesioriebeckite, or crocidolite; it is often referred to as the 'Stone of Patience' in spiritual circles.
Field identification & locations
Identify in the field by its distinct waxy sky-blue color and extreme hardness (cannot be scratched by a steel knife). Commonly found in Brazil, South Africa, and Virginia (USA).
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