Bixi, which mineral scientific name tourmaline, it is a kind of boron silicate mineral, still the most abundant mineral, its color is mainly red, yellow, blue, green, purple, brown, black and so on. The Bixi's chemical formula is very complex which be written as (Na , Ca) (Mg , Fe2 +, Fe3+,Li,Al)3AL6[Si6O18](Bo3)3(OH; F)4. Its crystal belongs to the three sides crystal which mostly show short column , long column or needle column form , the both end has different conical surfaces, section take the form of spherical trigonometry, crystal except that black, colourless and opaque , generally can see dichroism obviously. The cylinder is long usually including much more element Fe and Mg, taking the form of tripartite column with element Mg, the crystal is crassitude; The lithium tourmaline often takes the form of needle.
1, Shape, Classification ownership, performance state
The products classification of tourmaline are mainly divided into several kinds from color, structure, composition content,etc.:
Color: Pink, Green, Black, White, Brown, Yellow and so on.
Structure: Crystal tourmaline, columniatioin form tourmaline, tripartite form awl brilliant tourmaline, spherics tourmaline, radial tourmaline (fibrous), latent crystalloid tourmaline,etc.
Ingredient: Magnesium tourmaline, Iron tourmaline, Sodium manganese, Chrome tourmaline and so on.
2, The spec. and granule of product ( picture of powder attached, Brazil and Xinjiang)

The granule can produce it from 325 mesh - 32000 mesh.