The Mohs scale of mineral hardness characterises the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and is one of several definitions of hardness in materials science.
Crystal Healing Chart: Crystal Formations and their Meanings. What are the Crystal Healing properties of different crystal formations and shapes? Discover how these common and unusual forms add extra special meanings to your crystals. #crystals #infographic