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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 .
It is composed of Kyanite-bearing quartz that weathers more slowly than the surrounding material. [1] The Kyanite Mining Corporation of Dillwyn has mined Willis Mountain long enough to reduce significantly the profile of the mountain. [1] [2]
The mountain was the site of an open-pit kyanite mine, which was under operation from 1947 to 1970. At the time of its discovery, the deposit of kyanite on the mountain was the world's largest [ 2 ] United States Environmental Protection Agency (EPA) testing has determined that approximately 450 residences in the vicinity relying on well water ...
Andalusite, kyanite, and sillimanite are the principal aluminium silicate minerals. [2] [3] [4] The triple point of the three polymorphs is located at a temperature of 500 °C (932 °F) and a pressure of 0.4 GPa (58,000 psi). These three minerals are commonly used as index minerals in metamorphic rocks.
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.
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
The mining industry in India is a major economic ... 'this region possesses India's 100 percent Kyanite, 93 ... Gold mines have been found at different locations of ...
Geophysicist Stephen E. Haggerty, researching small, one hectare kimberlite pipes in Liberia found that Pandanus candelabrum, better known as the chandelier tree, is a kimberlite botanical indicator, growing selectively atop the pipes. [4] Bauxite, kyanite and barite may also be mineable. Sand and ceramic-grade clay are locally mined throughout ...