Byssolite
| Synonyms: | Actinolite-asbestos, Amiantus |
| Variety of: | Actinolite |
| Classification: | Not recognised by IMA |
| Chemical formula: | Ca2(Mg,Fe2+)5Si8O22(OH)2 |
| Crystal system: | Monoclinic |
| Density (g/cm3): | 2,9 - 3,2 |
| Tenacity: | Flexible |
| Cleavage: | Fair |
| Fracture: | Brashly |
| Hardness (Mohs): | 5,5 - 6 |
| Colour: | Dark-green, blue-green, white |
| Lustre: | Vitrious, silky |
| Streak: | White |