A great specimen of Elbaite Cleavelandite to add to your collection. Elbaite is a form of bi colour Tourmaline. Really nice termination. Cleavelandite is the white matrix a variety of Albite. Pics clearly show defined bands – clear to light green to dark green. Perched on a clear plastic pad for enhanced display.
2.3cm x 2.2cm x 3.3cm, 11g.
Stak Nala, Skardu, Pakistan.
Sodium Lithium Aluminum Boro-Silicate Hydroxide.
Elbaite belongs to the group of minerals known as the Tourmalines. It is the most colorful member of this group. It is often cut as a gemstone, sliced into colorful cross-sections or simply appreciated as a natural specimen by many rock collectors. The many varied colors of Elbaite make it arguably the most colorful of the precious stones.
Elbaite contains many variety names based on colour. A beautiful blue variety is called indicolite (also known as indigolite). Pink to red is called rubellite. Green is known as verdelite. Most famous variety is a pink and green combination called watermelon tourmaline. Often a specimen can have more than one colour zone in the same crystal. These zones can alternate in color from the inside to the outside or from the top to bottom. Elbaite is strongly pleochroic which means that a transparent crystal will appear darker when viewed down the long axis of the crystal. A green or blue Elbaite can appear black when viewed from such an angle.
Cleavelandite is named after Parker Cleaveland, a professor of geology and mineralogy, early 1800s.