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.
蓝晶石以其沿晶体方向硬度变化而著称——平行方向为4.5，垂直方向为6.5-7。
| 晶系 | Triclinic |
| 矿物分类 | 09 Silicates |
| 莫氏硬度 | 4.5-7.0 |
| 比重 | 3.53-3.65 |
| 颜色 | Blue, white, gray, green |
| 光泽 | Vitreous |
| 条痕色 | Colorless |
| 解理 | Perfect {100} |
| 断口 | Splintery |
| 透明度 | Translucent |
| 晶体习性 | Bladed, columnar |
莫氏硬度
| 莫氏硬度 | Reference Mineral |
|---|---|
| 1 | Talc |
| 2 | Gypsum |
| 3 | Calcite |
| 4 | Fluorite |
| 5 | Apatite |
| 6 | Orthoclase |
| 7 | Quartz |
| 8 | Topaz |
| 9 | Corundum |
| 10 | Diamond |
晶系
| 特性 | Value |
|---|---|
| 晶系 | Triclinic |
| Axial Relationships | a ≠ b ≠ c, α ≠ β ≠ γ ≠ 90° |