Corundum Mineral Specimen, Pack of 12

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Here is the corrected text: Twelve corundum samples, approximately 1 inch (3cm) in size, are great for studying mineral hardness and crystal habit – only diamond is harder! The perfect size for use in classroom identification labs and exercises, they correlate well with Next Generation Science Standards Evidence Statements. They are ideal for exercises designed to distinguish between crystal habit and cleavage. Each specimen comes in a clear, labeled, and barcoded bag for ideal storage. The average specimen size is 2-3 cm. This aluminum oxide has a Mohs scale hardness of 9, making it one of the hardest minerals on the planet. Corundum often grows in long, hexagonal crystals and can sometimes be found as gemstones, particularly ruby and sapphire. These mineral specimens are fantastic for use in mineral hardness exercises, as well as lessons in differentiating between cleavage and crystal habit.