This sample of scheelite is displayed in the Smithsonian Museum of Natural History. Scheelite is an oxide mineral of tungsten and calcium. It has the composition CaWO4. This sample is about 12x12 cm and is from Schuang, China.
This sample is about 10x8 cm and is from Arizona and Mexico. The gem is 12.4 carats. The sample at right is about 8x8 cm and is from Ivrea, Piemonte, Italy.
This sample is about 7x7 cm and is from Tong Wha, South Korea.