Pronounced u-art, and short for universal asynchronous receiver-transmitter, the UART is a computer component that handles asynchronous serial communication. Every computer contains a UART to manage the serial ports, and some internal modems have their own UART.
1 Color. 2  Color of a rock depends on the minerals present and on their grain size. 3  Generally, rocks that contain lots of feldspar and quartz are light colored, and rocks that contain lots of pyroxenes, olivines, and amphiboles (ferromagnesium minerals) are dark colored.
Major Concepts. 1  Foliated rocks - slate, phyllite, schist, gneiss, mylonite. 2  Non-foliated rocks - quartzite, marble, hornfels, greenstone, granulite. 3  Mineral zones are used to recognize metamorphic facies produced by systematic pressure and temperature changes.