Tincalconite ps. After Borax (Mullane Coll.)

Item Description

A striking, very lightweight plate of a forest of tannish-white pseudomorphs of tincalconite after sharp, spiky, tabular borax crystals from the U.S Borax Mine of California. There are some broken crystals on this example, but this remains a highly representative specimen of this rare and very unusual pseudomorph. Excellent material from this famous district. They are so lightweight you really have trouble believing these are natural crystals, but they are. These are super pseudos. Ex Mullane Collection.