mineral
White howlite (likely carved or shaped)
Howlite, Ca₂B₅SiO₉(OH)₅
AI-generated identification · may be incorrectOpaque white to gray with fine gray veining and a dull-to-waxy luster; hardness 3.5 on Mohs scale, monoclinic crystal system. The small, partly obscured specimen cannot be identified with certainty from appearance alone.
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Physical properties
Opaque white to gray with fine gray veining and a dull-to-waxy luster; hardness 3.5 on Mohs scale, monoclinic crystal system. The small, partly obscured specimen cannot be identified with certainty from appearance alone.
Formation & geological history
A borate mineral formed in evaporite deposits, commonly in arid basins; known occurrences are generally Cenozoic in age. It is often shaped or polished for small decorative objects and beads.
Uses & applications
Used for carvings, beads, and inexpensive jewelry; dyed howlite is sometimes sold as turquoise imitation.
Geological facts
Howlite is named after Canadian chemist and geologist Henry How, who described it in 1868.
Field identification & locations
Look for a soft, white, opaque material with irregular gray-brown web-like veins; it is softer than glass and can be scratched by a steel point. Common sources include California, Nova Scotia, and Turkey.
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