12PK Raw Porphyritic Granite, Igneous Rock Specimen - Approx. 1"- Geologist Selected & Hand Processed - Great for Science Classrooms - Eisco Labs 12 sold2026 The cooler and heater will

The cooler and heater will delay to work if you set the delay time(PL: 0~7min) not 0

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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 The cooler and heater will12PK 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