| A | B |
|---|
| Intrusive | A rock formed underground |
| Extrusive | A rock formed above ground |
| Plutonic | A rock formed underground |
| Volcanic | A rock formed above ground |
| Vesicles | gas pockets formed in a rock |
| Mafic | High density, dark igneous rocks |
| Felsic | Low density, light colored igneous rocks |
| Continental Igneous Rocks | Light colored rocks formed at or below the surface of the land |
| Intermediate Igneous rocks | Rocks formed where the ocean crust and continental crust collide |
| Intermediate Igneous rock example | Andes Mountains |
| Oceanic igneous rocks | Rocks formed in the ocean or beneath the ocean crust. |
| Ultra-mafic igneous rocks | formed in the mantle |
| Pumice | extrusive, continental (occasionally intermediate) , vesicular, non-crystalline igneous rock |
| Rhyolite | less than 1 mm grain, continental extrusive, can vesicular or not, igneous rock |
| Granite | Intrusive, 1 mm - 10 mm grain size (coarse texture), continental formed igneous rock. |
| Pegmatite | Continental, intrusive, 10mm or larger grain size, igneous rock |
| Andesite | Intermediate (50% light, 50% dark) extrusive, less than 1 mm grain size, fine textured igneous rock |
| Diorite | Intermediate (50% LIGHT, 50% Dark), 1 mm - 10 mm grain size), coarse-grained igneous rock |
| Basalt | Extrusive, oceanic less than 1mm fine grained Igneous rock |
| Gabbro | Intrusive, oceanic 1 mm to 10 mm grain size, coarse-grained igneous rock |
| Peridotite | Intrusive, mantle-formed, 1 mm - 10mm coarse grained igneous rock |
| Phaneritic texture | Grains can be seen |
| Aphanitic | Grains cannot be seen |
| Conchoidal Break | A fracture that has a broken shell appearance. |
| Obsidian | A Dark, glassy, continental (or intermediate...despite the darkness) non vesicular igneous rock |
| Scoria | Extrusive, oceanic less that 1 mm-grain sized igneous rock |
| Foliated | Minerals start to become aligned, are fully aligned or are banded |
| Non-Foliated | Grainy texture, "blurry" form of parent |
