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 nuchal translucency scan (also called the NT scan) uses ultrasound to assess your developing baby's risk of having Down syndrome (DS) and some other chromosomal abnormalities, as well as major congenital heart problems.The NT scan measures the clear (translucent) space in the tissue at the back of your baby's neck.he NT scan is offered to all pregnant women in the first trimester. The screening is widely available, but because it requires special training and equipment, not all healthcare providers provide it. Ultrasound exam Find out what doctors look for and how ultrasound exams are done.