![]() ![]() The 3 brown Tourmalines pictured below show an Inert (Diamagnetic) response to an N52 magnet. Iron ions in brown Tourmalines are often not magnetically detectable because only very low concentrations of iron are needed to create color through the iron-titanium (Fe2+-Ti4+) charge transfer process. The iron is derived from mixing with Schorl. Another example is brown and orange Tourmaline, as discussed below:īrown and Orange: Dravite is typically a brown or orangey brown Tourmaline colored by iron to titanium charge transfer (Fe2+-Ti4+). Some Dravite and Uvite gems are also black. For example, not all black Tourmalines are Schorl. The transition metal impurities and charge transfer processes that appear in one species may also appear in other species. Gems of different species can have the same color. Different species generally can’t be distinguished from one another by their color or magnetic responses or magnetic susceptibility measurements. Tourmaline species are classified according to chemical compositions that are often unrelated to color or magnetism. 2- About the Magnetic Susceptibility Index Garnet pg 14- Gem Garnet Classification System.Garnet pg 13- Distinguishing Between Garnet Species and Varieites.Garnet pg 12- Ugrandite Garnets: Grossular Garnet.Garnet pg 11- Ugrandite Garnets: Andradite & Uvarovite.Garnet pg 10- Rhodolite & Chrome Pyrope.Garnet pg 9- Pastel Pyrope: A New Variety. ![]()
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