3. the metamorphic (Metamorphic Rock).Caused by the action of thermal variables. Pressure, and chemical reactions, making the texture of the rocks. The ore consisted of stone and structural change; Metamorphism of the stone is in a State of suspended solids, which are divided into two types, namely.A praetphapboriwen cold (Regional metamorphism) caused a wide area by the heat and pressure cause the new mineral or Crystal. There's a new sort of mineral samples and show the fine lines parallel (Foliation) due to the original ore is compressed until the arrangement is vertical or parallel bars, such as gneiss (Gneiss), stone (Schist), chit and slate (Slate), etc.Metamorphism (Contact metamorphism) caused by thermal metamorphism and aqueous chemical reactions that came up with the magma with local stone. There is no influence of the pressure too much. Chemical reactions may cause some new mineral or mineral occurrence has instead of in the original stone. Metamorphic happens, there will be a new sort of mineral samples. Do not show the fine lines parallel (Nonfoliation) such as marble (Marble), the stone of the quality sites (Quartzite).
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