Igneous Rocks. Formation of Igneous Rocks Igneous comes from the Latin word ignis, which means fire…
Igneous Rocks (most important ones for us underlined) IntrusiveExtrusive Granite Rhyolite
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description
Igneous Rocks (most important ones for us underlined) IntrusiveExtrusive Granite Rhyolite (Quartz, K feldspar, Na Plagioclase) Light in color, often pinkish, with few dark minerals Diorite Andesite (Na,Ca Plagioclase, Biotite, Hornblende) - PowerPoint PPT Presentation
Transcript of Igneous Rocks (most important ones for us underlined) IntrusiveExtrusive Granite Rhyolite
Igneous Rocks (most important ones for us underlined)
Intrusive Extrusive
Granite Rhyolite(Quartz, K feldspar, Na Plagioclase)Light in color, often pinkish, with few dark minerals
Diorite Andesite(Na,Ca Plagioclase, Biotite, Hornblende)Intermediate in color, “salt and pepper” for diorite, dark to light gray for andesite
Gabbro Basalt(Ca plagioclase, pyroxene, olivine)Dark in color, usually black, gabbro has shiny crystals
SEDIMENTARY (most important ones for us underlined)
(uniform layering on a large and small scale)
Clastic
Conglomerate (grains bigger than 2mm)Sandstone (grains .06mm to 2 mm)Siltstone (grains .002mm t0 .06mm)Shale (grains less than .002mm)
Chemical
Limestone (CaCO3)Dolostone (CaMg (CO3)2)Halite (NaCl)Gypsum (CaSO4.2H2O)
Metamorphic (most important ones for us underlined)
(Produced from pre-existing rocks of all kinds by heat, pressure and shearing. Often layered, but distinguished from sedimentary rocks by wavy foliation)
Slate (slightly metamorphosed shale, dull, no crystals visible)
Phyllite (more metamorphosed shale, shiny, but crystals still too small to distinguish easily)
Schist (still more metamorphosed shale, shiny highly foliated, mica usually obvious, individual crystals easily seen)
Gneiss (very highly metamorphosed shale, sandstone or igneous rock of various types, often banded with not so obvious foliation)
Marble (metamorphosed limestone)
