Min. Order:
1 Ton
Price:
US$ 1
Place of origin:
China
Supply Ability:
12000 tons
Tourmaline (Chemical equation NaR3Al6[Si6O18][BO3]3(OH,F)4) belongs to the trigonal crystal system and occurs as long, slender to thick prismatic and columnar crystals that are usually triangular in cross-section, vitreous luster, resinous luster in sections, It is transparent to translucent and non cleavage with 7.0 - 7.5 Mohs hardness range and Specific gravity range from 2.98 to 3.20, Tourmali
[Related Keywords : Tourmaline, black Tourmaline]