Glass Hardness Plates – 3″ × 2″ × 1/4″

“Durable glass plates designed to help determine the hardness of unknown minerals in the field.
Used to determine mineral hardness
Based on the Mohs scale of mineral hardness
Ideal for testing unknown minerals in field conditions
Custom-swiped edges help reduce the risk of accidental injury
Simple and easy to use
Pack of 10”

BG19175-SP