Andesite Specimen, Andesite Specimen for introduction to igneous rock classification and identifying minerals within igneous rocks., Pack of 12

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Abundant phenocrysts in fine-grained matrix offer great demonstration of igneous porphyryFor use in classroom identification labs and exercisesCorrelates well to Next Generation Science Standards Evidence StatementsTexture and chemistry variation are useful for students learning about differing cooling ratesThe fine-grained felsic matrix contains larger, identifiable hornblende crystals, indicating two different rates of coolingExample of porphyry in igneous rock