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.

변성암에서 형성되는 알루미노실리케이트 광물로, 방향에 따라 경도가 다르게 나타난다.

결정계 Triclinic
광물 분류 09 Silicates
모스 경도 4.5-7.0
비중 3.53-3.65
색상 Blue, white, gray, green
광택 Vitreous
조흔색 Colorless
벽개 Perfect {100}
단구 Splintery
투명도 Translucent
결정 습성 Bladed, columnar

모스 경도

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.
모스 경도 Reference Mineral
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

결정계

Triclinic
Kyanite crystallizes in the Triclinic crystal system.
특성 Value
결정계 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.