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acid dropper bottle, 10 ml LDPE polyethylene with screw-on cap, cheaper by the dozen - unit of 12
$ 6.00
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anthracite - metamorphic "hard coal" from eastern Pennsylvania - unit of 5 student specimens
$ 4.20
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Apache tears - obsidianite cores from a flow converting to perlite - classroom set of 10
$ 7.50
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dacite - teaching hand specimen of gray porphyritic dacite
$ 9.50
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