Kyanite
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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.
Kyanite is remarkable for having variable hardness depending on crystal direction — 4.5 parallel to the length and 7 across. It is an important metamorphic index mineral indicating high-pressure conditions. Its blue color makes it a minor gemstone.
| Kristal Sistemi | Triclinic |
| Mineral Sınıfı | 09 Silicates |
| Mohs Sertliği | 4.5-7.0 |
| Özgül Ağırlık | 3.53-3.65 |
| Renk | Blue, white, gray, green |
| Parlaklık | Vitreous |
| Çizgi Rengi | Colorless |
| Dilimlenme | Perfect {100} |
| Kırılma | Splintery |
| Şeffaflık | Translucent |
| Kristal Alışkanlığı | Bladed, columnar |
Mohs Sertliği
| Mohs Sertliği | Reference Mineral |
|---|---|
| 1 | Talc |
| 2 | Gypsum |
| 3 | Calcite |
| 4 | Fluorite |
| 5 | Apatite |
| 6 | Orthoclase |
| 7 | Quartz |
| 8 | Topaz |
| 9 | Corundum |
| 10 | Diamond |
Kristal Sistemi
| Özellik | Value |
|---|---|
| Kristal Sistemi | Triclinic |
| Axial Relationships | a ≠ b ≠ c, α ≠ β ≠ γ ≠ 90° |