mineral

Dyed blue howlite cabochon

Howlite, Ca₂B₅SiO₉(OH)₅; commonly dyed vivid blue and sold as “turquenite”

AI-generated identification · may be incorrect

White to gray, porous borate mineral with dark gray veining, vitreous-to-dull luster, and triclinic crystals; Mohs hardness 3–3.5, specific gravity about 2.5–2.6. This specimen is polished into a rounded cabochon and heavily dyed blue.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Howlite forms in evaporite-associated borate deposits through low-temperature alteration and precipitation, especially in arid basins; it is generally geologically young, commonly Cenozoic. Major sources include California and Nova Scotia, Canada.

Uses & applications

Used primarily for inexpensive beads, cabochons, carvings, and turquoise imitations; it has little industrial importance. The polished surface is suitable for jewelry but scratches relatively easily.

Geological facts

The characteristic irregular dark veining can resemble turquoise, although natural howlite is usually white or gray. Dye may concentrate in pores and fractures, producing uneven color.

Field identification & locations

Identify it by its low hardness, porous texture, gray web-like veins, and blue dye; a cotton swab with acetone may reveal dye transfer, though testing can damage the finish. Common material comes from California and Canada.