EARTHSC 1108 Lecture Notes - Lecture 4: Pegmatite, Peridot, Beryllium
5 Apr 2016
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1: organisms - shells, bones of animals, tree sap etc. rocks - igneous, metamorphic, sedimentary basic layers of planet earth gems coming from rocks!! the rock cycle. Dynamic transition through time of 3 rock types the origin of minerals, rocks. *know the basic rocks and earth processes* where do gems form igneous environments. In rock formed by deposition of grains as precipitation of minerals in water metamorphic environments. In rock changed by heat, pressure, and finds http://www. gemselect. com/other-info/gemstone-formation. php gems forming in igneous environments (two types) Magma and lava: molten rock material and hot, watery fluids rich in dissolved glass magma vs lava = intrusive vs extrusive: extrusive environments and rocks extrusive rx and environments: Forms crystals in fluid and gas filled cavities. Cool quickly at earths surface (makes small crystals) Not a significant source of gems most important role for extrusive rocks: brings up to the surface gems that has already formed deeper in the mantle extrusive rx:
