Metamorphic Rock Lab - JCC GEL 111 Geology Unit Rocks Minerals Metamorphic Rocks Metamorphic rocks are rocks that have undergone a change from their

Metamorphic Rock Lab - JCC GEL 111 Geology Unit Rocks...

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JCC – GEL 111 Geology Unit: Rocks & Minerals Metamorphic Rocks Metamorphic rocks are rocks that have undergone a change from their original form due to changes in temperature, pressure or chemical alteration . The classification of metamorphic rocks is based on the minerals that are present and the temperature and pressure at which these minerals form. These changes always take place without melting, although the temperature may be high enough to cause the rocks to become quite plastic. Since rocks of all types are primarily made of the same eight kinds of elements, the kinds of minerals that form in metamorphic rocks depends mostly on the temperature, the pressure, and the time. The common minerals in metamorphic rocks are the same as the rock-forming silicates found in igneous rocks with the addition of a few high-temperature, high-pressure forms. Some of the common metamorphic minerals are elongated in the direction perpendicular to the directed pressure. These are called FOLIATED rocks. The word foliate comes from the Latin word for ‚ sheet ‚ as in ‚
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  • Fall '16
  • Wanda Roberts
  • Metamorphic rocks, gneiss, METAMORPHIC ROCK IDENTIFICATION

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