What do you need to know (meaning understand, not just memorize) to do spectacularly well on Quiz 10? The essential terms and concepts are listed below. Writing out answers to each of the following would be an excellent way to prepare.
Mantle, crust, core, tectonic plates, sedimentary, metamorpic & igneous rock, lithification, metamorphism, petrifaction, hydrothermal, geode, intrusive & extrusive rock, pegmatite, vug, floater, bog oak, lode, eluvial, alluvial.
Three layers of Earth: relative proportions, where gems form, rock vs mineral, steps of the rock cycle, intrusive vs extrusive magma and crystal sizes, factors necessary for gem formation, three modes of gem formation: examples of each, process of petrifaction, gems which form in mantle, why pegmatites are so gem rich, how do doubly terminated and floater cyrstals form?, two groups of organic gems with respect to their formation: examples of each, primary vs secondary gem deposits, eluvial vs alluvial (practical and ecomonic factors and examples).
Lithification, petrifaction, kimberlite, lamproite, pegmatite, staurolite, proteinaceous, eluvial, alluvial.