My periodic table poster is now available! Halite and Borax mixed crystal. This is an attractive crystal of halite (basically salt) and borax (sodium borate) from the Rhodes salt marsh in Nevada. Source: eBay seller ilickrocks Contributor: Theodore Gray Acquired: 8 February, 2009 Text Updated: 8 February, 2009 Price: $5 Size: 1.5" Composition: NaCl + Na2B4O7\[CenterDot]10H2O