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Name__________________________________ Rocks and Minerals Test Review KEY TERMS TO KNOW…. Streak The color of the mineral in powder form Luster How the mineral reflects light Density How closely packed the mineral’s molecules are Inorganic Not made up of living things or of things that were ever living Crystalline A regular repeating structure Cleavage How the mineral splits along weak areas Consistent chemical composition Chemicals that make up the substance are the same all the way through Igneous Rock that forms when magma cools and hardens Stratification The layering of sedimentary rock Cross Beds Layers of rock characterized by slanting layers Metamorphic Rock that is formed due to pressure and heat Minerals Inorganic solids that have a characteristic chemical composition, an orderly internal structure, and a characteristic set of physical properties Rocks A mixture of both solid organic matter and mineral Sedimentary Rock composed of sediment that has been compressed or cemented together and hardened Intrusive Igneous Igneous rock that forms when magma “intrudes” or enters into another rock mass and then cools Depositional Environment What it was like in the area when the sediment settled or deposited itself there MORE INFO TO KNOW!!! What are the three major types of rocks? 1._Igneous 2. _Sedimentary 3. _Metamorphic Name FOUR ways to tell if a substance is a mineral 1. _Is inorganic 2. _Occurs naturally 3. _Has crystalline form 4. __Has a consistent chemical composition What are the two main groups of minerals? Silicates Non-Silicates