A hydrated form occurs naturally as the minerals colemanite, nobleite and priceite. Economically important sources of boron are the minerals colemanite, rasorite (kernite), ulexite and tincal. The mineral Colemanite was named in his honor. Further testing revealed it was the colemanite form of borax. They produce zinc and lead concentrates as well as boric acid colemanite. Association minerals include montmorillonite, chlorite, calcite, colemanite, veatchite, sphalerite, pyrite, marcasite, galena and dolomite. The use of ores like colemanite has declined following concerns over arsenic content. Later in 1921, a large deposit of colemanite was discovered near Callville Wash. Colemanite is a secondary mineral that forms by alteration of borax and ulexite.