Glass Hardness Plates for Mineral Testing in Earth science and environmental science are the perfect sized plate for mineral testing. Determine the hardness of minerals.
The perfect sized plate for mineral testing! Determine the hardness of minerals using these durable glass plates. If the mineral scratches the plate, it has a hardness factor greater than 5.5 on Moh's hardness scale. Ideal 1" x 2" x 1/4" size for field or lab testing. Sold in packages of 10 plates.
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