Marianne Weiss
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Tourmaline with Smoky Quartz and Lepidolite. This and other rare mineral specimens for sale on the CuratorsEye.com

Greatness in Gradients The Tourmaline is one profoundly varied mineral with its long, striated crystal formations and no other gemstone has such a wide range of color. Tourmaline often manifests a.

The Mohs scale of mineral hardness. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and is one of several definitions of hardness in materials science. The method of comparing hardness by seeing which minerals can scratch others, however, is of great antiquity, having first been mentioned by Theophrastus in his treatise On Stones, c. 300 BC, followed by Pliny the Elder in his Naturalis Historia, c. 77 AD.

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

Weighing in at 325.14 carats and priced well over two million dollars, this extraordinary tsavorite is one of the largest most valuable gems ever to be discovered in East Africa.

Giant Size Top Color Clean Tsavorite Discovered in East Africa. Weighing in at carats and priced well over two million dollars, this extraordinary tsavorite is one of the largest most valuable gems ever to be discovered in East Africa.