mineral

Dyed Howlite

Borosilicate hydroxide (Ca2B5SiO9(OH)5)

Hardness: 3.5 (natural state), Color: Vivid purple/pink (dyed), Luster: Sub-vitreous to dull, Crystal structure: Monoclinic, Cleavage: Indistinct, Specific Gravity: 2.4-2.6.

Hardness: 3

Identified May 4, 2026More mineral →

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Physical properties

Hardness: 3.5 (natural state), Color: Vivid purple/pink (dyed), Luster: Sub-vitreous to dull, Crystal structure: Monoclinic, Cleavage: Indistinct, Specific Gravity: 2.4-2.6.

Formation & geological history

Formed in evaporite deposits in arid regions. Howlite is a borate mineral that occurs in cauliflower-like nodules. The specimen in the image has been tumbled and artificially dyed vibrant purple.

Uses & applications

Primarily used for decorative purposes, costume jewelry, and lapidary tumbling. Often used as an imitation for more expensive stones like turquoise or charoite.

Geological facts

While naturally white or grey, howlite is extremely porous, allowing it to take dyes very well. In its natural form, it is sometimes called silky magnesite or white turquoise.

Field identification & locations

Identify in the field by its nodular form and white color with dark grey veining. When dyed, look for dye concentration in surface cracks and its significantly lower hardness compared to natural purple stones like amethyst.