| Classification | Characteristics | Rock Name | Typical Parent Rock |
|---|---|---|---|
| Foliated | Distinguished by slaty cleavage, schistosity, or gneissic foliation; mineral grains show preferred orientation | Slate Phyllite Schis Gneiss | Shale, sandstone |
| Granoblastic (nonfoliated) | Granular, characterized by coarse or fine interlocking grains; little or no preferred orientation | Hornfels Quartzite Marble Argillite Greenstone Amphibolite Granulite | Shale, volcanics Quartz-rich sandstone Limestone, dolomite Shale Basalt Shale, basalt Shale, basalt |
| Porphyroblastic | Large crystals set in fine-grained matrix | Slate to gneiss | Shale |