2. If you consider it as one mineral, feldspar is the most common mineral and quartz comes in second, especially when you consider the whole crust, continental plus oceanic crust. Feldspar is called a group of minerals only for the convenience of geologists.he most common mineral of the Earth's continentsâthe world we spend our time inâis quartz, the mineral SiO 2. Nearly all the sand in sandstone, in the deserts of the world and on its riverbeds and beaches is quartz.
Transabdominal Ultrasound. A transabdominal ultrasound is used to look at the pelvic organs. Gel is placed on your abdomen. Then a small, handheld unit called a transducer is gently moved around to view the pelvic organs. The transducer sound waves make a picture on the TV screen.
The diagnostic medical sonographer presses an instrument called an ultrasound transducer to the parts of the patientâs body that are being examined. The transducer emits pulses of sound that bounce back, causing echoes. The echoes are then sent to the ultrasound machine, which processes them and displays them as images.