Obsidian Specimen, Obsidian Specimen, also known as volcanic glass, forms from lava that cools almost immediately upon eruption., Pack of 12

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Volcanic glass formed through nearly instantaneous quenching of lavaCorrelates well to Next Generation Science Standards Evidence StatementsObsidian shares many physical properties with its major chemical component, quartz, despite looking dissimilarDespite being dark in color, obsidian is made up of microcrystalline quartz, demonstrated by sharing hardness and conchoidal fracture often exhibited by quartzFor use in classroom identification labs and exercise