| Major Rock Types | |||
|---|---|---|---|
| Sediments and Sedimentary Rocks | Metamorphic Rocks | Igneous Rocks | |
| Intrusive Igneous (magma) | Extrusive Igneous (lava/ash) | ||
| chert | anthracite coal | andesite | |
| clay/claystone | breccia | diabase | basalt |
| coal | gneiss | diorite | obsidian |
| diatomaceous earth | greenstone | dunite | pumice |
| dolomite | marble | gabbro | rhyolite |
| gravel/conglomerate | metabasalt | granite | scoria |
| graywacke | metabentonite | harzburgite | tuff (ash) |
| greensand | metadiabase | migmagtite | |
| limestone (crushed) | metarhyolite | norite | |
| mudstone | phyllite | pegmatite | |
| outwash | quartzite | troctolite | |
| sand/sandstone | schist | ||
| shale | serpentinite | ||
| silt/siltstone | slate | ||
| till | |||