| Mineral class | Silicates : Inosilicates : Tremolite glaucophan riebeckite group |
| Chemical formula | Na2Fe5Si8O22(OH)2 |
| Crystal system | Monoclinic |
| Habitus | |
| Cleavage | Perfect in two directions. |
| Hardness | 4 |
| Density | 3.4 |
| Color | Blue, black, dark green, translucent to opaque. |
| Streak | Greenish brown. |
| Luster | Vitreous to silky. |
| Description | |
| Occurance | In magmatic and metamorphic rocks. |
| Associates | |
| Notes |
Type locality : Socotra island, Indian Ocean, Yemen. Named after the German traveler, E. Riebeck (1853-1885). Crocidolite is the name of riebeckite form of asbetos. |
| Locations |
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| To silicate index. |
Mineral group index. |
Main index. |
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