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For example, blue indicolite tourmaline is the only blue gemstone of any kind that will show a drag response when a neodymium magnet is applied. Any blue tourmaline that is diamagnetic can be identified as paraiba tourmaline colored by copper in contrast to magnetic blue tourmaline colored by iron. [22]
As a gemstone, elbaite is a desirable member of the tourmaline group because of the variety and depth of its colours and quality of the crystals. Originally discovered on the island of Elba , Italy in 1913, it has since been found in many parts of the world.
Rose muscovite from the Harding pegmatite mine Blue apatite crystals at the Harding pegmatite mine. Pegmatites form under conditions in which the rate of new crystal nucleation is much slower than the rate of crystal growth. Large crystals are favored. In normal igneous rocks, coarse texture is a result of slow cooling deep underground. [14]
Citrine “A powerful gemstone crystal in a range of deep yellows, oranges, and yellow-cream-white, the citrine gemstone is said to bring abundance and wealth into one’s life,” Salzer says.
This is a list of gemstones, organized by species and types. Minerals ... Rock crystal (var.) Shocked quartz (var.) Smoky ... Tourmaline; Ulexite; Zircon; Asterism ...
Crystal of titanite with adularia and minor clinochlore on matrix Fluorite crystal sitting beside a glassy, dark green tourmaline crystal, which itself sits atop a green tourmaline of a lighter color. All sit on a bed of sparkly, bladed stark white albite Crystals of turquoise, from Copper Cities Mine, Globe-Miami District, Arizona, USA
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