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3D3DHalite 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