Igneous rocks with pictures

Vesicular Basalt

TEXTURE: Aphanitic (fine-grained) COMPOSITION: Mafic (dark)

Granite

TEXTURE: Phaneritic (coarse-grained) COMPOSITION: Felsic (granitic), MINERALS: (quartz, plagioclase feld.,amphibole/hornblende

Gabbro

TEXTURE: Phaneritic (coarse-grained) COMPOSITION: Mafic/Basaltic, MINERALS: (olivine, amphibole & feldspar) intrusive

Volcanic Breccia Tuff

TEXTURE: Pyroclastic(fragmental) COMPOSITION: Andesitic(intermediate)

Periodite

TEXTURE: coarse-grained COMPOSITION: Mafic MINERALS: , (olivine, pyroxene, amphibole) intrusive

Diorite

TEXTURE: coarse-grained, COMPOSITION:Andesitic(Intermediate) MINERALS: (orthoclase f., pyroxene, amphibole) intrusive

Rhyolite

TEXTURE: fine-grained COMPOSITION: Granitic(Felsic) MINERALS: (feldspar, quartz) extrusive

Basalt

TEXTURE: fine-grained COMPOSITION: Mafic MINERALS: (plagioclase, pyroxine) extrusive

Andesite

TEXTURE: fine-grained (aphanitic), COMPOSITION:Intermediate(andesitic) MINERALS: (plagioclase, pyroxene, hornblende) extrusive

Obsidian

TEXTURE: glassy brown/black

Porphyritic Andesite

TEXTURE: porphyritic COMPOSITION: Andesitic (intermediate), MINERALS: (amphibole, plagioclase)

Porphyritic Rhyolite

TEXTURE: porphyritic porphyritic COMPOSITION: Felsic (light) MINERALS: (rhyolite, amphibole)

Scoria

TEXTURE: vesicular COMPOSITION: Mafic/Basaltic extrusive

Pumice

COMPOSITION: Felsic (granitic) TEXTURE: vesicular/glassy,

Ferromagnesian Silicates

silicates with iron and/or magnesium in their structure. Most ferromagnesium minerals are dark-colored and more dense than the non-ferromagnesian silicates.