mineral
Dumortierite Quartz
Dumortierite in Quartz (SiO2 with Al7BO3(SiO4)3(O,OH)3)
Hardness of 7 on the Mohs scale, typically blue, violet, or greenish-blue in color, vitreous to greasy luster, hexagonal crystal system, no distinct cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically blue, violet, or greenish-blue in color, vitreous to greasy luster, hexagonal crystal system, no distinct cleavage, specific gravity around 2.65.
Formation & geological history
Formed in high-temperature aluminium-rich regional metamorphic rocks, pegmatites, and as an inclusion within quartz crystals during hydrothermal processes.
Uses & applications
Used primarily in lapidary arts, tumbled stones, cabochons for jewelry, and ceramic manufacturing due to its ability to fire into a bright white porcelain.
Geological facts
Dumortierite often forms needle-like inclusions inside clear or milky quartz, giving the host quartz a rich denim-blue or indigo color.
Field identification & locations
Easily identified by its distinct blue color inclusions within quartz, commonly sourced from Madagascar, Namibia, France, and the USA.
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