10 Facts About Kyanite

Kyanite is a typically blue aluminosilicate mineral, found in aluminium-rich metamorphic pegmatites and sedimentary rock.

Kyanite is strongly anisotropic, in that its hardness varies depending on its crystallographic direction.

Kyanite is used as a raw material in the manufacture of ceramics and abrasives, and it is an important index mineral used by geologists to trace metamorphic zones.

Kyanite occurs in biotite gneiss, mica schist, and hornfels, which are metamorphic rocks formed at high pressure during regional metamorphism of a protolith rich in aluminium .

Kyanite is occasionally found in granite and pegmatiteand associated quartz veins and is infrequently found in eclogites.

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Kyanite is one of three common minerals having the composition.

Kyanite is the polymorph most stable at high pressure, while andalusite is the most stable at lower temperature and pressure and sillimanite is the most stable at higher temperature and lower pressure, with the three polymorphs equally stable at the triple point near 4.

Kyanite is often used as an index mineral to define and trace a metamorphic zone that was subject to a particular degree of metamorphism at great depth in the crust.

Kyanite occurs in Manhattan schist, formed under extreme pressure as a result of a continental collision during the assembly of the supercontinent of Pangaea.

Kyanite is used primarily in refractory and ceramic products, including porcelain plumbing and dishware.