This is a colored scanning electron micrograph (SEM) image of crystals of tungsten metal, called a tungsten forest, coating the inside of an electron gun of a SEM. The energy of the beam of electrons produced by the gun is so powerful that it evaporates the tungsten metal, which then cools and crystallizes on the inner surface of the gun’s chamber. This image has a magnification of 1,920 times its original size when viewed at a size of 10 centimeters.
Calcium oxalate (CaC2O4 or Ca (COO)2) imaged using a SEM (scanning electron micrograph)
This image came from a kidney stone. Kidney stone crystals are formed by the precipitation of calcium oxalate in urine. The resulting hard, round stones, which are also known as calculi, may cause severe pain, especially as they pass down the urinary tract. Large stones may need to be surgically removed or broken down using ultrasound therapy.
However, calcium oxalate may also be used in the manufacture of ceramic glazes.