Tourmaline is a mineral belonging to the silicate group, known for its wide range of colors and its complex chemical composition . Its general formula is (Na,Ca)(Li,Mg,Al,Fe)₃(Al,Mg,Cr,Fe,V)₆(BO₃)₃(Si,Al,B)₆O₁₈(OH,F)₄. This variety of chemical composition allows tourmaline to appear in almost every color imaginable, from black to pink, from blue to green, and even in multicolored colors within the same crystal.
Tourmaline has a hardness of 7-7.5 on the Mohs scale, making it quite resistant to wear and suitable for use in jewelry. Tourmaline crystals are often prismatic, elongated, and may have vertical striations.
Tourmaline is a mineral belonging to the silicate group, known for its wide range of colors and its complex chemical composition . Its general formula is (Na,Ca)(Li,Mg,Al,Fe)₃(Al,Mg,Cr,Fe,V)₆(BO₃)₃(Si,Al,B)₆O₁₈(OH,F)₄. This variety of chemical composition allows tourmaline to appear in almost every color imaginable, from black to pink, from blue to green, and even in multicolored colors within the same crystal.
Tourmaline has a hardness of 7-7.5 on the Mohs scale, making it quite resistant to wear and suitable for use in jewelry. Tourmaline crystals are often prismatic, elongated, and may have vertical striations.