| 609tl ((THENARDITE pseudomorph after MIRABILITE)), $15 MINIMUM BID, Boron Open Pit Mine, Kramer Borate Deposit, Boron, Kerns County, California, 5.5 x 4.5 x 2.5 cm, Miniature | |
 | An uncommon and rare occurrance that was collected by Jim Minette in the settling ponds west of the Open Pit Mine in Boron. This is a hydrous sodium sulfate. The delicate crystals typically are sharp and can be hoppered but are very lightweight almost like styrofoam. There are 7 photos on mindat.org under Thenardite, Boron. This specimen was coated to preserve it and is now hollow. ex Jim Minette collection. |
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