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Kyanite is a typically blue aluminosilicate mineral, found in aluminium-rich metamorphic pegmatites and sedimentary rock. It is the high pressure polymorph of andalusite and sillimanite , and the presence of kyanite in metamorphic rocks generally indicates metamorphism deep in the Earth's crust .
Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety.
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.
The minerals kyanite and sillimanite are polymorphs of andalusite, each occurring under different temperature-pressure regimes and are therefore rarely found together in the same rock. Because of this the three minerals are a useful tool to help identify the pressure-temperature paths of the host rock in which they are found.
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide
The Old English Lapidary, for instance, detailed the healing properties of stones, reflecting the belief that gemstones could cure illnesses and provide spiritual protection. Kitson argues that lapidaries in this period served a dual purpose: they were not only scientific texts that described natural phenomena but also moral and religious ...
Sillimanite or fibrolite is one of three aluminosilicate polymorphs, the other two being andalusite and kyanite.A common variety of sillimanite is known as fibrolite, so named because the mineral appears like a bunch of fibres twisted together when viewed in thin section or even by the naked eye.
It is the birth stone of March. [5] Aquamarine is a fairly common gemstone, [6] rendering it more accessible for purchase, compared to other gems in the beryl family. [7] Overall, its value is determined by weight, color, [5] cut, and clarity. [8] It is transparent to translucent and possesses a hexagonal crystal system. [9]
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