Get acquainted with one of the most interesting products of geological processes with this introductory collection of real specimens of igneous rock. Igneous rocks are formed by the cooling of molten rock, either magma or lava and are thus often direct results of volcanic activity; examples include obsidian, pumice, and basalt. The Igneous Rock Bag is an economy collection of 6 specimens representative of igneous rock family. Each generous specimen is 1.25" to 1.5" and is contained in a zip lock bag with a label.
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