Large Cabinet, 17.7 x 10.8 x 9.3 cm
Soda Lake, Carizzo Plains, San Luis Obispo County, California, USA
Ex. Al Ordway

This is an extraordinary example of the species, an aesthetic cluster of thenardite crystals in bipyramidal, matte luster, translucent dark-gray crystals. They range to 4 cm on a side. The thenardite crystals are accompanied by snow white puffs of the rare borate, ulexite. For a large cabinet specimen, the crystals are remarkably pristine and for a gray specimen, it is remarkably aesthetic. These are generally considered best of species material, and good ones are seldom seen on the market today.