mineral
Blue-dyed howlite (likely)
Howlite, Ca₂B₅SiO₉(OH)₅; dyed blue, often sold as imitation turquoise
AI-generated identification · may be incorrectPolished, opaque blue pebble with pale veining. Howlite is monoclinic, Mohs hardness 3.5, typically white with a vitreous-to-subvitreous luster; dye may obscure its natural appearance. Exact identification cannot be confirmed from the image alone.
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Physical properties
Polished, opaque blue pebble with pale veining. Howlite is monoclinic, Mohs hardness 3.5, typically white with a vitreous-to-subvitreous luster; dye may obscure its natural appearance. Exact identification cannot be confirmed from the image alone.
Formation & geological history
Howlite forms as a borate mineral in evaporite deposits, commonly in arid settings; its age varies by deposit. The blue color is likely added by dye after mining and polishing.
Uses & applications
Used for beads, cabochons, and decorative objects; dyed pieces imitate turquoise and are mainly valued as inexpensive jewelry or craft material.
Geological facts
Howlite is porous and readily accepts dye, making brightly colored imitations common.
Field identification & locations
Look for unnaturally vivid, even color and dark or pale spiderweb-like veins; a scratch or solvent test can damage the piece, so use gemological testing for confirmation. Natural howlite occurs notably in California and Nova Scotia.
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