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Granite
light rock that has crystals large enough to be seen with the naked eye
Diorite
Gabbro
porphyritic granite
porphyritic diorite
porphyritic gabbro
rhyolite
andesite
basalt
porphyritic rhyolite
porphyritic andesite
porphyritic basalt
obsidian
pumice
scoria
rhyolite tuff
andesite tuff
basalt tuff
dark rock with either hardened ash or soft ash
phaneritic
a term used to describe igneous rocks that have large crystals that are visible to the naked eye.
aphanitic
a term used in geology to describe the texture of igneous rocks that have such fine grains that their mineral crystals are not visible to the naked eye.
porphyritic
igneous rocks with large crystals set in a fine-grained matrix.
porphyritic-phaneritic plutonic
a texture of igneous rock that has both large crystals (phenocrysts) and smaller groundmass crystals.
porphyritic-phaneritic volcanic
pegmatitic
a coarse-grained igneous rock that contains large crystals of quartz, feldspar, and mica.
glassy
vesicular
trapped air bubbles rapid cooling
pyroclastic
high silica and explosive when formed (ashy)
volcanic breccia
large rock chunks
tuff
a light, porous rock formed by the consolidation of volcanic ash.
