Mineral

Breciated Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Hardness: 3.5 on Mohs scale; Color: Creamy white with brown/reddish-brown veining; Luster: Sub-vitreous to dull; Crystal structure: Monoclinic; Cleavage: None

Hardness: 3
Color: Creamy white with brown/reddish-brown veining
Luster: Sub-vitreous to dull

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 3.5 on Mohs scale; Color: Creamy white with brown/reddish-brown veining; Luster: Sub-vitreous to dull; Crystal structure: Monoclinic; Cleavage: None

Formation & geological history

Formed in evaporite deposits as nodules. This specific piece is a 'brecciated' or dyed variety where metamorphic-like veining is present, often found in arid environments through chemical precipitation.

Uses & applications

Primarily used in decorative carvings, cabochons for jewelry, and as a popular stone for metaphysical or lapidary collecting. Frequently used as an imitation for turquoise when dyed blue.

Geological facts

Howlite was first discovered by Henry How in 1868 in Nova Scotia, Canada. Even though it is fairly soft, it is highly sought after by carvers because it takes a high polish and accepts dyes exceptionally well.

Field identification & locations

Identify by its distinctive spider-web veining (matrix) and soft, chalky texture on unpolished surfaces. Not to be confused with Magnesite, which has a higher magnesium content. It is mostly found in Canada, the USA, and Turkey.

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