mineral
Howlite
Howlite (Ca2B5SiO9(OH)5)
AI-generated identification · may be incorrectHardness of 3.5 on Mohs scale, white or milky color with dark grey or black web-like veins, vitreous to sub-vitreous luster, and monoclinic crystal system.
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Physical properties
Hardness of 3.5 on Mohs scale, white or milky color with dark grey or black web-like veins, vitreous to sub-vitreous luster, and monoclinic crystal system.
Formation & geological history
Formed as borate minerals in evaporite deposits, primarily found in ancient lake beds in Nova Scotia and California.
Uses & applications
Commonly used in ornamental carvings, beads, and polished tumbled stones, and frequently dyed blue to imitate turquoise.
Geological facts
Howlite is extremely porous, which makes it very easy to dye different colors, particularly to simulate more expensive gemstones.
Field identification & locations
Easily identified by its characteristic web-like matrix patterns on a chalky white background and a low hardness that allows it to be scratched by a copper coin.
