Multinary, Tourmaline, Structural properties, Trigonal

• Al-B-Ca-F-H-Li-Mn-Na-O-Si
• Al-B-Ca-F-Fe-H-Li-Na-O-Si
• Al-B-F-Fe-H-Li-Mn-Na-O-Si
• Al-B-Ca-Fe-H-K-Mg-Na-O-Si
• Al-B-Ca-Fe-H-Mg-Na-O-Si-Ti
• tourmaline
• metalloid
• chalcogen
• silicate
• multinary