Tourmaline
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Complex borosilicate
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Tourmaline is a group of complex borosilicate minerals famous for their wide range of colors. Watermelon tourmaline shows pink centers with green rims. The most common variety, schorl (black), accounts for 95% of all tourmaline.
| Système Cristallin | Trigonal |
| Classe Minérale | 09 Silicates |
| Dureté Mohs | 7.0-7.5 |
| Densité | 2.82-3.32 |
| Couleur | Black, green, pink, blue, watermelon |
| Éclat | Vitreous |
| Trait | Colorless |
| Clivage | None |
| Cassure | Conchoidal to uneven |
| Transparence | Transparent |
| Habitus Cristallin | Prismatic with triangular cross-section |
Dureté Mohs
Mohs Hardness: 7,0 – 7,5
1 Soft10 Hard
| Dureté Mohs | Reference Mineral |
|---|---|
| 1 | Talc |
| 2 | Gypsum |
| 3 | Calcite |
| 4 | Fluorite |
| 5 | Apatite |
| 6 | Orthoclase |
| 7 | Quartz |
| 8 | Topaz |
| 9 | Corundum |
| 10 | Diamond |
Système Cristallin
Trigonal
| Propriété | Value |
|---|---|
| Système Cristallin | Trigonal (Rhombohedral) |
| Axial Relationships | a = b = c, α = β = γ ≠ 90° |
Explore on Science FYI
Frequently Asked Questions
What is the hardness of Tourmaline?
Tourmaline has a Mohs hardness of 7.0-7.5.
What crystal system does Tourmaline belong to?
Tourmaline crystallizes in the Trigonal crystal system.
What color is Tourmaline?
Tourmaline is typically Black, green, pink, blue, watermelon.
What type of luster does Tourmaline have?
Tourmaline exhibits a Vitreous luster.
What is the chemical formula of Tourmaline?
The chemical formula of Tourmaline is Complex borosilicate.