volcanic rock
rock formed from lava erupted from a volcano
obsidian
naturally occurring volcanic glass
melaphyre
igneous rock
volcanic bomb
volcanic projectile, recognisable later by shape
Yellow Neapolitan Tuff
a type of volcanic rock
volcanic breccia
rock formed by the cementation of large volcanic debris released during a volcanic eruption
andesite
intermediate igneous rock
porphyry
variety of igneous rock
amygdaloid
rock
Izu stone
volcanic rock from the Izu Peninsula
Archean felsic volcanic rocks
felsic volcanic rocks formed in the Archean Eon
basalt
mafic igneous rock
pyroclastic rock
rocks composed solely or primarily of fragments derived from explosive volcanic activity
pumice
light coloured highly vesicular volcanic rock
extrusive rock
igneous rock formed when magma emerges above the Earth's surface before cooling
cantera
volcanic rock
scoria
type of volcanic rock
felsite
very fine grained volcanic rock that may or may not contain larger crystals