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Ward's® Granite (Porphyritic)
Coarse-grained, with microcline, biotite and horblende phenocrysts.
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Ward's® Obsidian
Shiny black volcanic glass showing conchoidal fracture and some spherulites.
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Ward's Science Essentials® Igneous Rocks Collection
Introduce your students to rocks formed from the cooling of magma and lava.
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