Staurolite
Fe2Al9Si4O23(OH)
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Staurolite is famous for its cruciform twinned crystals, which form cross-shaped penetration twins. These natural crosses have been collected as good luck charms for centuries. It is an important metamorphic indicator mineral.
| 晶系 | Monoclinic |
| 鉱物分類 | 09 Silicates |
| モース硬度 | 7.0-7.5 |
| 比重 | 3.65-3.77 |
| 色 | Dark reddish-brown to black |
| 光沢 | Vitreous |
| 条痕色 | Gray to white |
| 劈開 | Poor {010} |
| 断口 | Subconchoidal |
| 透明度 | Translucent |
| 結晶習性 | Prismatic, cruciform twins |
モース硬度
Mohs Hardness: 7.0 – 7.5
1 Soft10 Hard
晶系
MonoclinicFrequently Asked Questions
What is the hardness of Staurolite?
Staurolite has a Mohs hardness of 7.0-7.5.
What crystal system does Staurolite belong to?
Staurolite crystallizes in the Monoclinic crystal system.
What color is Staurolite?
Staurolite is typically Dark reddish-brown to black.
What type of luster does Staurolite have?
Staurolite exhibits a Vitreous luster.
What is the chemical formula of Staurolite?
The chemical formula of Staurolite is Fe2Al9Si4O23(OH).