Rock Picture Gallery
IGNEOUS ROCK PICTURES (About Igneous Rocks)
AaA rugged form of basalt lava.
AndesiteThe typical intermediate arc lava.
AnorthositeA rare plutonic feldspar-only rock.
BasaltA bubbly, crystally chunk of this igneous rock from Kilauea.
DioriteA plutonic rock between granite and gabbro.
DuniteA plutonic rock made of straight olivine.
FelsiteThe volcanic version of granite.
GabbroThe crystallized, plutonic version of basalt.
GraniteThe rock that makes up the bulk of the continents.
GranodioriteAlmost diorite, except that this rock has quartz.
LapillistoneA volcanic rock formed of little ash balls.
ObsidianA useful volcanic glass.
PahoehoeSmooth-skinned flows of basalt lava.
PegmatiteThe igneous rocks with the biggest crystals.
PeridotiteDark, dense, rarely seen rock from the Earth's mantle.
PerliteA lightweight volcanic rock of great usefulness.
PorphyryAn igneous rock with large mineral grains in a fine matrix.
PumiceA rock made from volcanic eruption products.
PyroxeniteAn uncommon ultramafic rock from the deep sea crust.
Quartz MonzoniteJust like granite, except it's short on quartz.
RhyoliteThe lava type with the highest silica content.
ScoriaA frothy volcanic product much like pumice.
SyeniteA plutonic, alkalic "granite-without-quartz."
TuffA rock made from volcanic ash.
Special Picture Galleries: Basalts, Granites, Obsidian, Pillow Lavas, Volcanic Rocks, Igneous Rock Textures
SEDIMENTARY ROCK PICTURES (About Sedimentary Rocks)
AgateA semiprecious chert of infinite variety.
AlabasterA white gypsum stone long prized for sculpture.
ArkoseA raw sandstone made from eroded granite.
AsphaltNatural, from a natural oil seep.
Banded Iron FormationExtremely ancient "tiger iron."
BrecciaRock made from broken rocks, breccia has many forms.
ChertA common siliceous rock type with much variety.
CoalThe original fossil fuel.
ConglomerateRocks made with extra-big grains.
CoquinaA limestone made from shell fragments.
DolomiteAn altered near-twin of limestone.
GraywackeAn impure sandstone also called wacke.
Gypsum RockA crusty chunk from a Nevada roadside.
LimestoneThe greatest carbon-bearing rock.
PeatBrown, vegetative precursor to coal.
Rock SaltThe only edible stone.
SandstoneWhere sand goes to and comes from.
ShaleRock made from mud and clay.
SiltstoneMade from sediment finer than sand.
TravertineA form of limestone created in springs.
Special Picture Galleries: Sedimentary Rocks, Limestones, Coquina, Concretions
METAMORPHIC ROCK PICTURES (About Metamorphic Rocks)
AmphiboliteHigh-grade rock, typically a hornblende schist.
BlueschistRock made by high-grade metamorphism in subduction zones.
CataclasiteA ground-up rock found in fault zones.
EclogiteThe most extreme metamorphic rock you can find.
GneissBanded, tough, it forms the lower crust.
GreenschistRock made by low-grade metamorphism of various rock types.
GreenstoneA dark rock made by metamorphism of basalt.
HornfelsTough and fine-grained, it forms where igneous rocks cook it.
MarbleThe metamorphic version of limestone.
MigmatiteA swirly rock produced by extreme metamorphism.
MyloniteA milled and melted rock from deep in fault zones.
PhylliteShiny, colorful rock made by metamorphism of slate.
QuartziteRugged rock made by metamorphism of sandstone.
SchistStriped rock made by metamorphism of mudstones.
SerpentiniteGreen, scaly metamorphosed ocean crust.
SlatePlaty rock made by early metamorphism of shale.
SoapstoneSoft and carvable, hydrothermally altered lava.
Special Picture Galleries: Metamorphic Rocks, Serpentinites, Slate, Phyllite
OTHER ROCKS
Chondrite MeteoriteThe commonest type of space stone.
FulguriteLightning striking sand makes this curious object.
GeodesThese rock-shop lumps have hollow, glittering interiors.
Iron MeteoritePieces of the cores of ancient asteroids.
Nakhlite (Mars Meteorite)A Martian meteorite that fell of 1911.
Shergottite (Mars Meteorite)A meteorite from the Martian mantle.
TektiteA meteorite made from Earth's crust by large impacts.
Thunder EggSolid, agate-filled lumps found in certain volcanic lands.
Special Picture Galleries: Geodes, Meteorites, Fulgurites, Artificial Rocks, Pet Rocks
Other picture galleries:
Fossil Pictures
Glaciers and Ice Pictures
Landform Pictures
Mineral Pictures
Geologic Features and Processes Pictures
Geology and Society Pictures
Free Geologic Wallpaper Pictures

