mineral

Turquenite (Dyed Howlite)

Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)

Hardness: 3.5 (Mohs scale), Color: Sky blue to turquoise (surface dyed), Luster: Sub-vitreous to earthy, Crystal Structure: Monoclinic (usually massive), Cleavage: None/Indistinct, Specific Gravity: 2.58

Hardness: 3

Identified March 13, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed in evaporite deposits as nodules. Natural howlite is white with grey/black veins; the specimen shown is an imitation turquoise created by immersion in blue dye under pressure.

Uses & applications

Primarily used in costume jewelry, beadwork, decorative carvings, and as a 'healing stone' in metaphysical markets. It is a common substitute for genuine turquoise.

Geological facts

Natural howlite was discovered in 1868 by Henry How. It is a very porous mineral, which makes it perfect for taking dye. When dyed blue, it is often sold as 'Turquenite' or 'Magnesite' (though true Magnesite is a different mineral).

Field identification & locations

Identify by performing a 'rub test' with acetone on a cotton swab; if color comes off, it is dyed. Real turquoise is much harder (5-6) and cool to the touch. It is widely available at gem shows and craft stores.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral