Mohs' Scale of Minerals Hardness Coffee Mug Candle Holder Obsidian: highly protective stone

Obsidian: highly protective stone

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Mohs' Scale of Minerals Hardness Coffee Mug Candle Holder Obsidian: highly protective stoneWith its sleek design and cool color palette, the Moh's Scale of Mineral Hardness Mug feels just as at home in the field as it does at the breakfast table. Featuring 19 minerals with hardness numbers, chemical formulas, and identifying characteristics, it's the perfect companion for geologists, rock collectors, and anyone who approaches the making of a cup of coffee with scientific rigor. Perfect for any hot beverage: coffee, tea, hot chocolate,