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.