Tourmaline is a silicate mineral that originates from Sri Lanka and was shipped to Europe by the V.O.C. for collections and jewellery. 95% of the natural tourmaline consists of schorl, a distinct type of tourmaline. There are also dravite and elbaite as important types.Top
Chemical & Physical Information
|Chemical Formula||(Ca,K,Na,-)(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,-)6(BO3)3(Si,Al,B)6O18(OH,F)4|
|Crystal habit||Parallel and elongated, needle-shaped prisms.|
|Fracture||Uneven, conchoidal and brittle.|
|Colour||Black, green, purple, pink and brown.|
|Opacity||Subtransparent to translucent.|
 Specimen from my personal collection, photo taken by me.