Check the listing for details. Howlite - calcium silicoborate nodule set. Listed at 10.45 USD. Howlite was first described by H. How in 1868 as silicoborocalcite. It is often found as nodules resembling gray cauliflower. At Tick Canyon, in Los Angeles County, howlite was embedded in colemanite.

$7.32
$10.45