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. Kyanite is also known as disthene or cyanite. [5] Kyanite is strongly anisotropic, in that its hardness varies depending on its crystallographic direction.

Disthene mineral data, information about Disthene, its properties and worldwide locations.

The mineral was once commonly called "disthene" which means "two strengths." Kyanite often occurs in long, bladed crystals. These have a hardness of 4.5 to 5 along the length of the crystals and 6.5 to 7 across the width of the crystals. Three minerals have a chemical composition of Al 2 SiO 5. These are kyanite, andalusite, and sillimanite.

蓝晶石也被称为 disthene 或 cyanite。 蓝晶石具有强烈的 各向异性 ，因为它的硬度根据其 结晶 方向而变化。 在蓝晶石中，这种各向异性与其特有的蓝色一起可被视为一种识别 特征 。

2023年6月18日 · “Disthène” refers to the mineral’s anisotropic properties, meaning “two strengths” in Greek. Meanwhile, Kyanite also goes by names such as “Blue Talc” and “Laminated Beryl” in some parts of the world due to its talc-like texture and elongated crystal formation.

Ancient Greek twice + force: compare French disthène. So called in allusion to its unequal hardness in two different directions, or from its positive and negative electric properties. disthene (plural disthenes) (mineralogy) Kyanite. “ disthene ”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

Metamorphosed peri-aluminous sedimentary rocks. Common world wide. Link to MinDat.org Location Data. From the Greek kyanos = "blue." Comments: Two terminated, bright blue crystals of kyanite in a white quartz matrix. Location: Barra do Salinas, Minas Gerais, Brazil. Scale: 9.5 x …

Disthene, also known as kyanite, was a plentiful ornamental stone found across the Realms. [4] [5] [6] Disthene cleaved easily but was difficult to facet-cut because it was prone to splitting in unwanted directions. This stone could easily be cleaved making it difficult to cut in facets without...

Kyanite is one of the most attractive blue minerals in nature. It sometimes exhibits intense shades of blue, or even multiple shades with color zoning in a single crystal. The color of Kyanite, combined with its well-formed and sometimes large crystals, make this mineral appreciated by both novice and expert collectors alike.

Cyanite : de cyan, en allusion à sa couleur ; disthène provient du grec di sthenos, "deux forces", en allusion aux propriétés électriques du minéral et non aux duretés comme cela a souvent été rapporté.