Rock Identifier
Blue Howlite (Dyed) (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral
mineral

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Hardness: 3.5 on Mohs scale; Color: Naturally white with grey/black veins (dyed blue here); Luster: Sub-vitreous to dull; Crystal structure: Monoclinic; Cleavage: None/Indistinct.

Hardness
3
Color
Naturally white with grey/black veins (dyed blue here)
Luster
Sub-vitreous to dull
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Physical properties

Hardness: 3.5 on Mohs scale; Color: Naturally white with grey/black veins (dyed blue here); Luster: Sub-vitreous to dull; Crystal structure: Monoclinic; Cleavage: None/Indistinct.

Formation & geological history

Formed in evaporite deposits in arid environments. Natural howlite is frequently found in nodules that resemble cauliflower. Most commercial turquoise-colored howlite is chemically dyed to mimic more expensive gemstones.

Uses & applications

Used primarily in decorative jewelry, beads, cabochons, and as a 'simulant' for turquoise or lapis lazuli due to its porous nature which absorbs dye well.

Geological facts

Howlite is named after Henry How, a Canadian mineralogist who first described it in 1868. In its natural white state, it is often marketed as 'White Buffalo Turquoise' despite having no geological relation to turquoise.

Field identification & locations

Identify in the field by its nodular shape and low hardness (scratched by a copper penny or knife). If dyed, color often concentrates in the 'veins' of the rock. Commonly found in California and Nova Scotia.

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