Open Adit™ - Kyanite Datasheet

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Kyanite (Cyanite, Disthene, Munkrudite) is a member of the aluminosilicate series, which includes the polymorph andalusite and the polymorph sillimanite. Kyanite is strongly anisotropic, in that its hardness varies depending on its crystallographic direction. While this is a feature of almost all minerals, in kyanite this anisotropism can be considered an identifying characteristic.

Kyanite's name derives from the Greek, kyanos, meaning blue, is a typically blue silicate mineral, commonly found in aluminium-rich metamorphic pegmatites and/or sedimentary rock.

Chemistry:

Al₂ SiO₅ - Aluminum Silicate

Class:

Sublass:

Blue, gray, white, green, dark gray, colorless

Streak:

White

Luster:

Vitreous to dull

Diaphaneity:

Transparent to translucent

3.6

4.5 - 7.5

Good

Uneven

Prismatic to tabular crystals, fibrous aggregates , granular, massive

Luminescence:

Non-fluorescent

Frequency:

Abundant

Origin:

Alsmost only metamorphic in regionally metamorphosed rocks, mica schists, gneisses, granulites and eclogites; less frequently magmatic in pegmatites and granites; rarely hydrothermal in quartz veins. A typical rock-forming mineral, associated with andalusite and sillimanite.

Occurence:

Barra do Salinas, Minas Gerais, Brazil; Pizzo Forno, Switzerland; Prilep, Macedonia; Keivy, Kola Peninsula, Russia.

Application:

Abrasives, ceramic products, electrical insulators. As a gemstone and mineral specimen.

Kyanite Gallery

Metaphysical Properties

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