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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 .
Kainite (/ ˈ k aɪ n aɪ t / or / ˈ k eɪ n aɪ t /) [4] (KMg(SO 4)Cl·3H 2 O) is an evaporite mineral in the class of "Sulfates (selenates, etc.) with additional anions, with H 2 O" according to the Nickel–Strunz classification.
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The name eclogite is derived from the Ancient Greek word for 'choice' (εκλογή, eklogḗ), meaning 'chosen rock' on account of its perceived beauty. It was first named by René Just Haüy in 1822 in the second edition of his work Traité de minéralogie .
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Kyanite is an aluminum silicate mineral that is typically formed under high pressure during the metamorphism of clay-rich (pelitic or argillaceous) rocks. Kyanite is also found in kimberlites, which are unusual intrusive rocks that contain diamonds. My class is studing rocks and one of my favorite ones are the Kyanite is is very pretty and cool.
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.
Undulose extinction of quartz in Orthogneiss. Undulose extinction or undulatory extinction is a geological term referring to the type of extinction that occurs in certain minerals when examined in thin section under cross polarized light.