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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      

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