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aplite - hand/display specimen of aplite from an aplite-pegmatite dike that intruded anorthosite
$ 9.50
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pyroclastic tuff balls - teaching hand specimens of unusual tuff snowballs - set of three
$ 9.50
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quartz diorite - teaching hand specimen of a subduction-related granitic rock
$ 7.50
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scoria - teaching hand/display specimen of maroon scoriaceous basalt ejecta from a cinder cone on Mauna Loa
$ 10.50
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