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Colemanite
U.S. Borax Mine, Kramer Borate deposit, Boron, Kramer District, Kern Co., California, USA
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Thumbnail
31 x 28 x 23 mm overall
Lustrous, glassy blades of pale yellow Colemanite to 7 mm across cover this specimen. This pristine thumbnail has Ed Swoboda's original thumbnail and label. It was held back by Ed for nearly 20 years, when I purchased it in the early 1990s.
ex. Ed Swoboda specimen
Specimen # TN212
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