mineral
Dyed turquoise-colored howlite or magnesite (likely imitation turquoise)
Howlite: Ca₂B₅SiO₉(OH)₅; magnesite: MgCO₃
AI-generated identification · may be incorrectOpaque, vivid blue-green, waxy to vitreous luster, and smoothly tumbled; likely Mohs hardness 3–4.5, with no visible crystal faces or cleavage. White/gray matrix veining is commonly present but appears minimal here.
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Physical properties
Opaque, vivid blue-green, waxy to vitreous luster, and smoothly tumbled; likely Mohs hardness 3–4.5, with no visible crystal faces or cleavage. White/gray matrix veining is commonly present but appears minimal here.
Formation & geological history
Howlite and magnesite form as secondary carbonate minerals in evaporite-rich or hydrothermal settings, commonly in Cenozoic and older sedimentary terrains. The intense uniform color strongly suggests artificial dyeing rather than natural turquoise.
Uses & applications
Used as an inexpensive turquoise substitute in beads, cabochons, and decorative carvings; generally unsuitable for durable jewelry because it is relatively soft and porous.
Geological facts
Natural turquoise is a hydrated copper-aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O, and typically shows blue-green color with matrix, variable opacity, and hardness around 5–6. Dye can concentrate in cracks and may transfer with acetone or a damp cotton swab, though testing can damage the piece.
Field identification & locations
Commonly sold as “dyed howlite,” “dyed magnesite,” or imitation turquoise; check for unnaturally saturated color, white pores, and dye pooling around fractures. Likely locations are commercial lapidary markets rather than a distinctive natural locality.
