Greenstone
| Type | Metamorphic Rock |
| Texture | Non-foliated to weakly-foliated; Fine-grained |
| Composition | Epidote and Chlorite |
| Index Minerals | Epidote and Chlorite |
| Color | Green |
| Miscellaneous | Harder than glass |
| Metamorphic Type | Regional |
| Metamorphic Grade | Low Grade (Low P – Low T) |
| Parent Rock | Basalt; Mafic igneous rocks |
| Metamorphic Environment | Low grade regional metamorphism along a convergent plate boundary |