mineral
Dyed howlite or magnesite cabochon
Howlite, Ca₂B₅SiO₉(OH)₅; commonly dyed vivid blue to imitate turquoise
AI-generated identification · may be incorrectOpaque electric-blue, polished, with faint white-gray matrix veining and vitreous-to-waxy luster. Howlite hardness is about 3.5 Mohs, monoclinic, with uneven fracture and low specific gravity (~2.5); the image alone cannot distinguish it confidently from dyed magnesite or blue resin.
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Physical properties
Opaque electric-blue, polished, with faint white-gray matrix veining and vitreous-to-waxy luster. Howlite hardness is about 3.5 Mohs, monoclinic, with uneven fracture and low specific gravity (~2.5); the image alone cannot distinguish it confidently from dyed magnesite or blue resin.
Formation & geological history
Howlite forms as a borate mineral in evaporite-related, often arid sedimentary environments, mainly in Cretaceous deposits; magnesite forms in altered ultramafic or carbonate rocks. The blue color is human-applied dye, not natural coloration.
Uses & applications
Used for inexpensive beads, cabochons, carvings, and turquoise imitations; unsuitable for durable rings because it scratches readily.
Geological facts
Dyed howlite is often marketed misleadingly as “turquenite” or imitation turquoise. Dye commonly concentrates in veins and surface cracks.
Field identification & locations
Check for a porous, chalky interior, gray veins, low hardness, and dye pooling in fractures; avoid acids or destructive tests. Major howlite sources include California and Nova Scotia, Canada.
