Igneous Rocks: Basalt vs. Gabbro by Kelly Peskura https://padlet.com/kpeskura15/9p208sn0etya Using your notes and prior knowledge explain the difference between Basalt and Gabbro rocks! Please include and explain what are the two rocks? How do they form? and What are they used for? Using your notes and prior knowledge explain the difference between Sandstone and Conglomerate rocks! Please include and explain what are the two rocks? How do they form? and What are they used for? And any other additional information you think is important (Color of the rock, etc.) en-us 2016-10-31 22:01:40 UTC 2023-03-28 23:44:08 UTC hello@padlet.com Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition similar to gabbro. The difference between basalt and gabbro is that basalt is a fine-grained rock while gabbro is a coarse-grained rock. kpeskura15 https://padlet.com/kpeskura15/9p208sn0etya/wish/134361197 2016-10-31 22:10:38 UTC https://padlet.com/kpeskura15/9p208sn0etya/wish/134361197 Most of the basalt found on Earth was produced in just three rock-forming environments: 1) oceanic divergent boundaries, 2) oceanic hotspots, and 3) mantle plumes and hotspots beneath continents. The images on this page feature some of these basalt-forming environments. kpeskura15 https://padlet.com/kpeskura15/9p208sn0etya/wish/134361629 2016-10-31 22:17:03 UTC https://padlet.com/kpeskura15/9p208sn0etya/wish/134361629 Basalt is used for a wide variety of purposes. It is most commonly crushed for use as an aggregate in construction projects. Crushed basalt is used for road base, concrete aggregate, asphalt pavement aggregate, railroad ballast, filter stone in drain fields, and may other purposes. Basalt is also cut into dimension stone. Thin slabs of basalt are cut and sometimes polished for use as floor tiles, building veneer, monuments, and other stone objects. kpeskura15 https://padlet.com/kpeskura15/9p208sn0etya/wish/134361679 2016-10-31 22:17:42 UTC https://padlet.com/kpeskura15/9p208sn0etya/wish/134361679 Gabbro is a coarse-grained, dark-colored, intrusive igneous rock. It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite. It is the most abundant rock in the deep oceanic crust. Gabbro has a variety of uses in the construction industry. It is used for everything from crushed stone base materials at construction sites to polished stone counter tops and floor tiles. kpeskura15 https://padlet.com/kpeskura15/9p208sn0etya/wish/134361893 2016-10-31 22:20:29 UTC https://padlet.com/kpeskura15/9p208sn0etya/wish/134361893 Gabbros are equivalent in composition to basalts. The difference between the two rock types is their grain size. Basalts are extrusive igneous rocks that cool quickly and have fine-grained crystals. Gabbros are intrusive igneous rocks that cool slowly and have coarse-grained crystals kpeskura15 https://padlet.com/kpeskura15/9p208sn0etya/wish/134361966 2016-10-31 22:21:49 UTC https://padlet.com/kpeskura15/9p208sn0etya/wish/134361966 Gabbro can be polished to a brilliant black luster. Brightly polished gabbro is used to make cemetery markers, kitchen counter tops, floor tiles, facing stone, and other dimension stone products. It is a highly desirable rock that stands up to weathering and wear kpeskura15 https://padlet.com/kpeskura15/9p208sn0etya/wish/134361994 2016-10-31 22:22:09 UTC https://padlet.com/kpeskura15/9p208sn0etya/wish/134361994 Gabbro is also used to make a number of rough-cut products such as curbing, ashlars, paving stones, and other products. kpeskura15 https://padlet.com/kpeskura15/9p208sn0etya/wish/134362041 2016-10-31 22:22:45 UTC https://padlet.com/kpeskura15/9p208sn0etya/wish/134362041 The most common use of gabbro is as a crushed stone or aggregate. Crushed gabbro is used as a base material in construction projects, as a crushed stone for road construction, as railroad ballast, and anywhere that a durable crushed stone is needed as fill kpeskura15 https://padlet.com/kpeskura15/9p208sn0etya/wish/134362093 2016-10-31 22:23:20 UTC https://padlet.com/kpeskura15/9p208sn0etya/wish/134362093 Basalt is usually grey to black in color, but rapidly weathers to brown or rust-red due to oxidation of its mafic (iron-rich) minerals into hematite and other iron oxides and hydroxides. kpeskura15 https://padlet.com/kpeskura15/9p208sn0etya/wish/134367754 2016-10-31 23:45:41 UTC https://padlet.com/kpeskura15/9p208sn0etya/wish/134367754 Gabbro is usually black or dark green in color. kpeskura15 https://padlet.com/kpeskura15/9p208sn0etya/wish/134367805 2016-10-31 23:46:20 UTC https://padlet.com/kpeskura15/9p208sn0etya/wish/134367805