S21136 - Tincalconite - $600
U.S. Borax Mine, Boron, Kramer District, Kern Co., California
Overall Size: 18.3 x 9 cm
A very handsome cabinet piece. The strange yet stable mineral of tincalconite with its thin chalk-white coating over borax crystals has gone from being relatively abundant to noticeably scarce after some 50 years.