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Contact SupplierThis Collection contains 50 Types of Basic Rocks Specimens of Igneous, Sedimentary & Metamorphic Rocks Types. These Rocks & Minerals Collections used for Practical Knowledge of Rocks Specimens & Minerals Specimens. A great collection to begin your study of sedimentary, metamorphic and igneous rocks. Fifty representative specimens of the rock types most often included in geology textbooks. Each specimen measures approx 1.5-2 inch in diameter.