12PK Raw Porphyritic Granite, Igneous Rock Specimen - Approx. 1"- Geologist Selected & Hand Processed - Great for Science Classrooms - Eisco Labs 12 sold2026 always follow care label instructions

always follow care label instructions

6 inch slim

Bearing steel

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12PK Raw Porphyritic Granite, Igneous Rock Specimen - Approx. 1"- Geologist Selected & Hand Processed - Great for Science Classrooms - Eisco Labs 12 sold2026 always follow care label instructions12PK Raw Porphyritic Granite, Igneous Rock Specimen Approx. 1" Geologist Selected & Hand Processed Great for Science Classrooms Eisco Labs Product Features PORPHYRITIC GRANITE Granite forms slowly in shallow or evolved magma chambers, and is also commonly found as magmatic intrusions in the crust. The large crystals are indicative of a slow cooling rate, and make mineral identification simple GREAT FOR GEOLOGY CLASSROOMS A must have sample when