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asymmetrical ripple marks in siltstone from the Moenkopi Formation - teaching hand specimen
$ 7.50
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colemanite - hydrous calcium borate from the Terry borate deposit, Inyo County, California - teaching hand specimen
$ 9.50
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peat - hand/display specimen of peat from the San Andreas fault zone, formed in a marsh that dried out roughly a century ago
$ 9.50
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serpentine - teaching student specimens of serpentine from the Melones Fault Zone - unit of 5 specimens
$ 4.20
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