This specimen occurs with albite, aquamarine beryl and a tiny terminated bluish green apatite crystal. It's members are the most common of the phosphorus-bearing minerals. Apatites are formed under a variety of conditions but most commonly occur as accessory minerals in igneous rocks. They also occur in marine sedimentary rocks formed by chemical deposition, in fossils, and in metamorphic rocks. Apatites vary widely in color from colorless to yellow, green, brown, red and blue.
Some apatites display a yellow fluorescence under ultraviolet light.
Group members exhibit hexagonal, prismatic crystals which may be stubby to elongated and are often terminated by dipyramidal faces. 2.65-2.90 Beryl is an important ore mineral of beryllium. It is typically found in cavities in granite and pegmatite and is also associated with tin ores and mica schists. Bluish beryls are known as aquamarines. The variations in color exhibited by beryls are probably due to small included quantities of different metallic oxides.