mineral

Howlite (White Buffalo Turquoise)

Howlite (Calcium Borosilicate Hydroxide), Ca2B5SiO9(OH)5

Hardness: 3.5 on Mohs scale; Color: Milky white with grey/black viny veining; Luster: Sub-vitreous to dull/earthy; Crystal Structure: Monoclinic (often found in nodules); Cleavage: None; Specific Gravity: 2.53-2.59

Hardness: 3
Color: Milky white with grey/black viny veining
Luster: Sub-vitreous to dull/earthy

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed in evaporite deposits within sedimentary basins, typically where boron-rich volcanic waters interact with Calcium-rich sediment. Common in arid environments like California and Nova Scotia.

Uses & applications

Used primarily in lapidary arts for beads, figurines, and cabochons. Because of its porosity, it is frequently dyed blue to imitate Turquoise or red to imitate Coral.

Geological facts

First discovered at Tick Canyon, California in 1868 by Henry How. It is naturally porous, which makes it the most commonly dyed gemstone in the world to mimic more expensive stones.

Field identification & locations

Identify by its characteristic 'spiderweb' grey veins and opaque white body. Unlike marble, it is softer and has a distinctive feel. It can be found in the field as cauliflower-like nodules in desert regions.

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