The Mohs scale of mineral hardness characterizes 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
Petrified Forest National Park in Arizona is definitely a drive-through park. All those million years ago this area was an upright tropical forest. Fallen trees accumulated in river beds and were buried by volcanic ash. Wondering what else there is to do in the area around The Petrified Forest? Geology Wonders