mineral
Blue Quartz
Silicon Dioxide (SiO2) with microscopic inclusions
Hardness: 7 on the Mohs scale. Color: pale to deep blue, grayish-blue. Luster: vitreous to greasy. Crystal structure: trigonal. Cleavage: none, exhibits conchoidal fracture. Specific gravity: 2.65.
- Hardness
- 7 on the Mohs scale
- Color
- pale to deep blue, grayish-blue
- Luster
- vitreous to greasy
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Physical properties
Hardness: 7 on the Mohs scale. Color: pale to deep blue, grayish-blue. Luster: vitreous to greasy. Crystal structure: trigonal. Cleavage: none, exhibits conchoidal fracture. Specific gravity: 2.65.
Formation & geological history
Formed in igneous, metamorphic, and sedimentary environments. The blue color is typically caused by microscopic fibrous inclusions of dumortierite, tourmaline, or crocidolite within the quartz matrix.
Uses & applications
Used in ornamental items, lapidary work, jewelry, and crystal collections.
Geological facts
Unlike naturally blue gemstones that derive color from trace elements like iron or titanium in the crystal lattice, blue quartz gets its distinct coloration from tiny mineral inclusions trapped inside during crystal growth.
Field identification & locations
Can be identified by its conchoidal fracture, hardness of 7 (will scratch glass), and distinctive bluish hue. Found worldwide including Brazil, the USA, and India.
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