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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.

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from Ethan Lazzerini

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

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from Simple & Interesting.

Ballybunion Castle, Ireland. I've always loved geology and this is sooo cool from a geological standpoint.

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