Igneous Rock
Obsidian- a dark volcanic glass that forms from the cooling of molten rock material.
Scoria- a dark extrusive igneous rock
Metamorphic Rock
Schist- a well-developed foliated rock
Hornfels- a fine-grained non-foliated rock with no specific composition
Sedimentary Rock
Shale- a clastic rock of that is made of clay size debris
Coal- an organic rock made of weathered plant debris
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