Tipos De Rocas Sedimentarias, Igneas Y Metamorficas En Ingles

Identification of Igneous Rocks |

Grain Size | Usual Color | Other | Composition | Rock Type |
fine | dark | glassy appearance | lava glass | Obsidian |
fine | light | many small bubbles |lava froth from sticky lava | Pumice |
fine | dark | many large bubbles | lava froth from fluid lava | Scoria |
fine or mixed | light | contains quartz | high-silica lava | Felsite |
fine ormixed | medium | between felsite and basalt | medium-silica lava | Andesite |
fine or mixed | dark | has no quartz | low-silica lava | Basalt |
mixed | any color | large grains in fine-grained matrix| large grains of feldspar, quartz, pyroxene or olivine | Porphyry |
coarse | light | wide range of color and grain size | feldspar and quartz with minor mica, amphibole or pyroxene | Granite |coarse | light | like granite but without quartz | feldspar with minor mica, amphibole or pyroxene | Syenite |
coarse | light to medium | little or no alkali feldspar | plagioclase and quartz withdark minerals | Tonalite |
coarse | medium to dark | little or no quartz | low-calcium plagioclase and dark minerals | Diorite |
coarse | medium to dark | no quartz; may have olivine | high-calciumplagioclase and dark minerals | Gabbro |
coarse | dark | dense; always has olivine | olivine with amphibole and/or pyroxene | Peridotite |
coarse | dark | dense | mostly pyroxene with olivine andamphibole | Pyroxenite |
coarse | green | dense | at least 90% olivine | Dunite |
very coarse | any color | usually in small intrusive bodies | typically granitic | Pegmatite |

Identificationof Sedimentary Rocks |

Hardness | Grain Size | Composition | Other | Rock Type |
hard | coarse | clean quartz | white to brown | Sandstone |
hard | coarse | quartz and feldspar | usually verycoarse | Arkose |
hard or soft | mixed | mixed sediment with rock grains and clay | gray or dark and "dirty" | Wacke/
Graywacke |
hard or soft | mixed | mixed rocks and sediment | round rocks in...