U.S. Borax open pit (Boron pit), U.S. Borax Mine (Pacific West Coast Borax; Pacific Coast Borax Co.; Boron Mine; U.S. Borax and Chemical Corp.; Kramer Mine; Baker Mine), Kramer Borate deposit, Boron, Kramer District, Kern Co., California, USA
This fine specimen consists of the multiple crystals of Tunellite from the Type Locality, with sharp form, pearlescent luster, and translucence. Tunellite is a rare hydrated strontium borate, first discovered at the U.S. Borax Mine in 1961. It is in excellent condition, and only a small cleave on the reverse. This is from only the second find at the mine, in 2004, and is an excellent specimen.