6PK Raw Biotite Gneiss, Metamorphic Rock Specimens - Approx. 1" - Geologist Selected & Hand Processed - Great For Science Classrooms - Class Pack - Eisco Labs
6PK Raw Biotite Gneiss, Metamorphic Rock Specimens - Approx. 1" - Geologist Selected & Hand Processed - Great For Science Classrooms - Class Pack - Eisco Labs