mineral
Dyed howlite or turquoise imitation
Howlite: Ca₂B₅SiO₉(OH)₅; turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O
AI-generated identification · may be incorrectPolished opaque blue cabochon with faint gray-white veining, waxy to vitreous luster, and no visible crystals. Howlite has Mohs hardness 3.5; turquoise is 5–6, with specific gravity about 2.5–2.8.
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Physical properties
Polished opaque blue cabochon with faint gray-white veining, waxy to vitreous luster, and no visible crystals. Howlite has Mohs hardness 3.5; turquoise is 5–6, with specific gravity about 2.5–2.8.
Formation & geological history
The vivid, uniform blue and pale vein pattern strongly suggest blue-dyed howlite, a common turquoise simulant; natural turquoise forms in arid copper-rich zones during secondary weathering, generally in relatively young oxidation deposits.
Uses & applications
Used as inexpensive jewelry, beads, carvings, and cabochons. Genuine turquoise has greater jewelry and collector value; dyed howlite is mainly ornamental.
Geological facts
Howlite is naturally white and porous, readily accepting dye. Acetone or alcohol may remove dye from inconspicuous areas, while a hot needle can damage or discolor treated material.
Field identification & locations
Field identification requires testing: turquoise is usually harder and copper-bearing, whereas dyed howlite may show concentrated blue in cracks and a white interior under a discreet scratch or drilled area. Common sources include China and the United States.
