Elbaite mineral. Elbaite is a mineral of the tourmaline group,chemically a boro-silicate of sodium,lithium and aluminium. It is trigonal with prismatic crystals with a striated surface,in a variety of colours such as green,orange,pinkish-red,yellow and blue. Different colours may occur together in the same crystal group. Elbaite is one of the more desirable tourmaline species for use in jewellery or as a collector's item. This specimen,from Santa Rosa in Minas Gerais,Brazil,is 10 centimetres tall |