mineral
Howlite
Ca2B5SiO9(OH)5
AI-generated identification · may be incorrectMohs hardness of 3.5, white or milky color with distinctive dark grey or black web-like veins, sub-vitreous to earthy luster, and monoclinic crystal system.
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Physical properties
Mohs hardness of 3.5, white or milky color with distinctive dark grey or black web-like veins, sub-vitreous to earthy luster, and monoclinic crystal system.
Formation & geological history
Forms in evaporite deposits through the precipitation of boron minerals in saline lakes, primarily found in Nova Scotia and California.
Uses & applications
Commonly used in polished decorative stones, bead jewelry, and frequently dyed blue or green to imitate turquoise.
Geological facts
Often called white turquoise due to its striking matrix pattern, though it is chemically unrelated to true turquoise.
Field identification & locations
Easily identified by its chalky white appearance, dark web-like matrix, and low hardness that allows it to be easily scratched by a knife.
