- Cabinet, 10.5 x 8.8 x 7.7 cm
- Boraxo Mine (Kern Borate; Boraxo Deposit; Boraxo No. 1 and No. 2; Clara Claim; Thompson Mine; Tenneco Mine), Inyo Co., California, USA
Large, lustrous and translucent, well-formed, light amber colemanite crystals up to 8.8 cm across from an extinct California locality, the Thompson Mine in Death Valley. Some of the faces have showy, very pronounced stepped growth. Ex. Mullane Collection.