mineral
Dyed Howlite (Turquenite)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
Hardness: 3.5 (Mohs scale), Color: Teal/Turquoise (dyed), Luster: Sub-vitreous to dull, Crystal Structure: Monoclinic (usually massive), Specific Gravity: 2.45-2.58
- Hardness
- 3
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Physical properties
Hardness: 3.5 (Mohs scale), Color: Teal/Turquoise (dyed), Luster: Sub-vitreous to dull, Crystal Structure: Monoclinic (usually massive), Specific Gravity: 2.45-2.58
Formation & geological history
Formed in evaporite deposits, usually as nodules. The teal color is achieved through an artificial dyeing process to mimic turquoise. Natural howlite is white with grey veins.
Uses & applications
Decorative purposes, jewelry, metaphysical use, and as an affordable substitute for genuine turquoise.
Geological facts
Howlite is extremely porous, which allows it to absorb dye easily. When dyed teal, it is often sold under the trade name 'Turquenite'. It was named after Henry How, a Canadian mineralogist.
Field identification & locations
Identify by its low hardness compared to real turquoise (which is Mohs 5-6). If the color looks too uniform or concentrated in surface cracks, it is likely dyed howlite. Common locations for original mineral: Nova Scotia (Canada) and California (USA).
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