mineral

Howlite (Dyed Turquoise)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Hardness: 3.5 on Mohs scale; Color: Naturally white, but here dyed blue; Luster: Sub-vitreous to earthy; Crystal structure: Monoclinic; Cleavage: None visible in massive form; Specific Gravity: 2.45-2.58

Hardness: 3
Color: Naturally white, but here dyed blue
Luster: Sub-vitreous to earthy

Identified April 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed in evaporite deposits as nodules. This specific specimen has been chemically dyed to mimic turquoise. Natural howlite is commonly found in desert environments where borate minerals accumulate.

Uses & applications

Used primarily in decorative jewelry, beads, and stone carvings. Because it is porous, it is the most common material used to create turquoise imitations.

Geological facts

Natural howlite is actually white with grey or black veins. It was first discovered in 1868 near Windsor, Nova Scotia, by Henry How. It is often sold under trade names like 'Turquernite' when dyed blue.

Field identification & locations

Identify in the field by its softness (it can be scratched by a steel needle, unlike real turquoise which is harder) and the appearance of white color if the stone is chipped or scratched, revealing the dye does not penetrate the center.

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Mineral/Rock

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Metamorphic Rock

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mineral