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"PARKWAY PLASTICS, INC."
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Ward's® Tuff (Rhyolitic)
Gray, fine, friable, with abundant small sanidine crystal fragments.
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Ward's® Andesite (Porphyry)
Gray andesite with phenocrysts of felspar and/or hornblende.
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Ward's® Diorite
Coarse, 'salt and pepper': dark pyroxene and light andesine. Provides perfect representation of an intermediate igneous rock.
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