Period+2+Group+3

Igneous Rocks

Rhyolite - felsic, fast cooling rate, extrusive, fine grained--grayish white with a little yellow. may have brown-red stripes Scorria - mafic, fast cooling rate, extrusive, fine grained-- red and very light (weight) has bubbles Granite - felsic, slow cooling rate, intrusive, coarse grained -- pink and white over all with black spots Andesite  - mafic, fast cooling rate, extrusive, fine grained -- gray-- may have little black specs Diorite - felsic, slow cooling rate, intrusive, coarse grained -- half felsic and mafic appearance (like oreo ice cream) still fesic Basalt- mafic, fast cooling rate, extrusive, fine grained- (yellow/ brown/ black mix) Pumice - felsic, fast cooling rate, extrusive, fine grained-- gray and very light (weight) Gabbro- mafic, half slow, half fast cooling rate, both intrusive and extrusive, porphyritic  Obsidian- felsic, fast cooling rate, extrusive, glassy texture (no crystals) -- Completely black but felsic

Sedimentary Rocks

Conglomerate - clastic, poorly sorted, contains fragments, round fragments - blob of pebbles Coal- organic, Black, contains plant material. - black Limestone - chemical, contains Geodes, bubbles when acid is applied, common in our area-redish brown Brecchia- clastic. poorly sorted,contain angular fragments- looks like cement Shale - clastic,well sorted, fossils and stratification-blackish gray <span style="color: rgb(0, 0, 102)">Chert -clastic well sorted, stratification, scratches limestone-whitish yellow <span style="color: rgb(0, 0, 102)">Sandstone <span style="color: rgb(0, 0, 102)">- clastic, well sorted, stratification, looks like sand <span style="color: rgb(0, 0, 102)">Coquina - organic, angular fragments, bubbles when acid is applied- sea shells <span style="color: rgb(0, 0, 102)">Siltstone-clastic, well sorted, stratification, bubbles when acit it applied- very red

Metamorphic Rocks

<span style="color: rgb(0, 51, 0)">Quartzite -non- foliated, originally quartz, formed by heat <span style="color: rgb(0, 51, 0)">Marble <span style="color: rgb(0, 51, 0)"> <span style="color: rgb(0, 51, 0)"> - non-foliated, originally limestone, formed by heat, sparkles- white <span style="color: rgb(0, 51, 0)">Schist- foliated- originally chlorinite, formed by pressure, breaks into layers <span style="color: rgb(0, 51, 0)">Gneiss- foliated, muscovite, formed by pressure and heat, banded <span style="color: rgb(0, 51, 0)">Slate- foliated, originally shale, formed by pressure,breaks into layers