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howlite - set of 6 typical small nodules of calcium silicoborate

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howlite   Ca2B5SiO9(OH)5   

Howlite was first described by H. How in 1868 as silicoborocalcite. Later it was identified as calcium silicoborate by James Dwight Dana and named after How. It is often found as nodules resembling gray cauliflower. 

Howlite was initially discovered in Nova Scotia, occurring as nodules embedded in anhydrite and gypsum. At Tick Canyon, in Los Angeles County, howlite was embedded in colemanite. The deposit was worked as the Sterling Borax Mine from 1908-1923 and was the second largest borax producer worldwide after the mines in Death Valley. Howlite's silica content made it useless as a source of boron, and for years it was common in the Tick Canyon mine dumps. These specimens are from Tick Canyon.

Each set has one or two specimens cut or broken open to show the white inside. Typically, these have a gray or black surface and a "cauliflower" appearance




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