Basalt Specimen, Basalt is formed quickly from an iron-rich magma and exhibits a dark color and small crystal size, Each

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Aphanitic volcanic rock forms from effusive eruptions, such as shield volcanoes of Hawaii, or deep ocean floorFor use in introduction to igneous rock classification and identificationCorrelates well to Next Generation Science Standards Evidence StatementsStudents can recreate cooling history of this sample based on texture and abundance of phenocrystsExample of aphanitic igneous rock