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.
It involves scanning with the ultrasound probe lying in the vagina. Transvaginal ultrasound usually produces better and clearer images of the female pelvic organs, because the ultrasound probe lies closer to these structures. The transvaginal ultrasound probe is thin, about 2cm diameter. The probe is covered with a disposable protective sheath.