Author:
Qjure
Book:
Qjurious
Type:
Info
Chapter:
1-40_.__.__
Tourmaline black
Clades: Borosilicates; 6-member single ring; Cyclosilicates; Silicates; Lapidae.
Chemical: (Na,Ca)(Al,Li,Mg)3?(Al,Fe,Mn)6(Si6O18)(BO3)3(OH)4.
Crystal system: Trigonal.