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 |