mineral
White Howlite
Howlite (Ca2B5SiO9(OH)5)
AI-generated identification · may be incorrectMohs hardness of 3.5, white to milky color with dark grey or black web-like veins, vitreous to sub-earthy luster, and monoclinic crystal system.
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Physical properties
Mohs hardness of 3.5, white to milky color with dark grey or black web-like veins, vitreous to sub-earthy luster, and monoclinic crystal system.
Formation & geological history
Forms as irregular nodules in evaporite deposits, primarily created through the evaporation of boron-rich saline lakes.
Uses & applications
Widely used in jewelry, carved decorative objects, and often dyed blue to imitate turquoise.
Geological facts
Howlite is extremely porous, which makes it easily absorb dyes to mimic other precious stones like turquoise or red coral.
Field identification & locations
Identified by its distinctive spiderweb matrix and relative softness that allows it to be easily scratched by a copper coin. Found notably in Nova Scotia and California.
