Staurolite (iron aluminum silicate hydroxide), always crystallized often with two indivuals intergrown at right angles forming a cross. Sometimes used as amulets or ornaments. A fairly common metamorhic mineral. Sample from Keivy, Kola Peninsula, Rus
Apatite (Ca5(PO4)3F, fluorapatite), used in the production of phosphate fertilizers and the production of salts of phosphoric acid and phosporous, a common mineral. Sample from Slyudyanka, Baikal region, Siberia, Russia.
Blacktail Prairie Dog (Cynomys ludovicianus) engaging in Jump-yip behavior - A strong arch of the back or "jump" followed by a shrill "yip" - Thought to occur when a predator has left the area and in territorial displays, Wyoming, USA