 | "White tincalconite pseudomorph after borax, from this classic location. Tincalconite is a mineral that is closely related to and often intimately associated with the mineral borax. Most old mineral specimens of borax are chalky white due to a chemical reaction from dehydration. They have actually altered (at least on their surface and ultimately throughout) to the mineral tincalconite with the loss of water molecules. This kind of alteration from one mineral to another, can leave the shape of the original crystal intact. Mineralogists refer to this as a pseudomorph, or "false shape", because the tincalconite has the crystal shape of the predeceasing borax. " Location: Baker Mine, Boron, Kramer District, Kern County, California Size: 7.6 x 6.4 x 5.1 cm. Weight: 1.0 lbs. Quantity Available: 1 Price: $100.00 |