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.
a pile of minerals this image shows some of the most common minerals you ll find in rocks this pile contains plagioclase feldspar potassium feldspar quartz muscovite mica biotite mica amphibole olivine and calciteotassium feldspar is another member of the feldspar mineral family like plagioclase feldspar potassium feldspars are silicate minerals that contain a considerable amount of you guessed it potassium