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howlite - set of 6 typical small nodules of calcium silicoborate

$ 5.00

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 and is offered here as a pair, with one cut specimen that shows the internal structure and the other a complete nodule.

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

These specimens ship in a small flat rate box unless combined with other purchases.

Select a set: You can select a set by telling us what is in the photo with it, a  black and silver pen, a black mechanical pencil or one of those plus some number of coins, or you can let us make the selection.

Making multiple purchases? Click on the "combine shipping" button in the shopping cart. We'll send an invoice with combined shipping. A link in that invoice will bring you back to checkout, no hassle.