Tincalconite after Borax

*from Kramer District, Boron, Kern County, California
*30 x 15 x 5 mm

Tincalconite is almost always a pseudomorph of some other borate. In this case it is believed to be after borax. Very Fragile and must be kept in an arid environment. 

ex: John Betts. ex: Don Halterman collection.