mineral
Howlite
Howlite, Ca2B5SiO9(OH)5
AI-generated identification · may be incorrectMohs hardness of 3.5, white or milky color with dark grey or black web-like veins, vitreous to sub-earthy luster, monoclinic crystal system.
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Physical properties
Mohs hardness of 3.5, white or milky color with dark grey or black web-like veins, vitreous to sub-earthy luster, monoclinic crystal system.
Formation & geological history
Forms as irregular nodules in evaporite deposits, primarily in boron-rich playa lakes.
Uses & applications
Widely used for ornamental carvings, beads, and as an imitation gemstone when dyed blue to mimic turquoise.
Geological facts
First discovered in Nova Scotia in 1868 by Henry How, a Canadian chemist and geologist.
Field identification & locations
Identified by its distinctive spiderweb matrix and softness, commonly sourced from Nova Scotia, California, and South Africa.
