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.
藍晶石は結晶方向によって硬度が変わることで知られる珍しい鉱物である。
| 晶系 | Triclinic |
| 鉱物分類 | 09 Silicates |
| モース硬度 | 4.5-7.0 |
| 比重 | 3.53-3.65 |
| 色 | Blue, white, gray, green |
| 光沢 | Vitreous |
| 条痕色 | Colorless |
| 劈開 | Perfect {100} |
| 断口 | Splintery |
| 透明度 | Translucent |
| 結晶習性 | Bladed, columnar |
モース硬度
| モース硬度 | 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° |