Kyanite

Al2SiO5

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Kyanite is remarkable for a hardness that changes with crystal direction, measuring about 4.5 parallel to the length of a crystal and roughly 7 across it. An aluminum silicate (Al2SiO5), it crystallizes in the triclinic system as bladed or columnar crystals with a vitreous luster, a colorless streak, perfect {100} cleavage, and a splintery fracture. Colors are typically blue, white, gray, or green, with a specific gravity between 3.53 and 3.65. Kyanite is an important metamorphic index mineral that signals high-pressure conditions, and its blue crystals are sometimes cut as gemstones. Its bladed crystals and perfect cleavage in one direction, combined with the directional hardness, make it distinctive.

Silicato de alumínio polimórfico, notável por dureza variável dependendo da direção do cristal. Comum em rochas metamórficas de alta pressão, especialmente em xistos alumínio-ricos. Frequentemente associado com feldspato, mica e quartzo

Sistema Cristalino Triclinic
Classe Mineral 09 Silicates
Dureza Mohs 4.5-7.0
Gravidade Específica 3.53-3.65
Cor Blue, white, gray, green
Brilho Vitreous
Traço Colorless
Clivagem Perfect {100}
Fratura Splintery
Transparência Translucent
Hábito Cristalino Bladed, columnar

Dureza Mohs

Mohs Hardness: 4,5 – 7,0
1 Soft10 Hard
Kyanite has a Mohs hardness of 4.5–7 on the 1–10 mineral hardness scale.
Dureza Mohs Reference Mineral
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Sistema Cristalino

Triclinic
Kyanite crystallizes in the Triclinic crystal system.
Propriedade Value
Sistema Cristalino Triclinic
Axial Relationships a ≠ b ≠ c, α ≠ β ≠ γ ≠ 90°

Frequently Asked Questions

What is the hardness of Kyanite?
Kyanite has a Mohs hardness of 4.5-7.0.
What crystal system does Kyanite belong to?
Kyanite crystallizes in the Triclinic crystal system.
What color is Kyanite?
Kyanite is typically Blue, white, gray, green.
What type of luster does Kyanite have?
Kyanite exhibits a Vitreous luster.
What is the chemical formula of Kyanite?
The chemical formula of Kyanite is Al2SiO5.