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.
metal, iron, & nickel. back | 1 | 2 | 3 | next. Iron meteorites, of course, are nealy 100% metal, although many contain the iron sulfide mineral troilite. Pallasites, a rare type of stony-iron meteorite, consist of olivine grains embedded in an iron-nickel metal matrix.etal, iron, & nickel. back | 1 | 2 | 3 | next. Iron meteorites, of course, are nealy 100% metal, although many contain the iron sulfide mineral troilite. Pallasites, a rare type of stony-iron meteorite, consist of olivine grains embedded in an iron-nickel metal matrix.