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anthracite - metamorphic "hard coal" from eastern Pennsylvania - unit of 5 student specimens
$ 4.20
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asbestos - tremolite (amphibole) asbestos - teaching hand specimen of fibers in a screw-cap pyrex tube
$ 9.50
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biotite mica - teaching student specimens collected from a pegmatite at Cardiff, Ontario - Unit of 5 specimens
$ 5.50
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concretion - cannonball concretion from the lower sandstone member of the Monterey Formation - hand specimen
$ 7.50
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concretion - cannonball concretion from the lower sandstone member of the Monterey Formation - hand/display specimen
$ 9.50
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concretion - cannonball concretion from the lower sandstone member of the Monterey Formation - large display specimen
$ 30.00
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