Order Crystallization of Black Tourmaline 1900gr 130mm from Madagascar

Size: 130x100x80mm
Weight: 1900 grams
Origin: Madagascar
Mineral: Tourmaline
Reference: 211206994

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mineralogy:
The word tourmaline refers to a group of minerals of the silicate family, subgroup of cyclosilicates, with the chemical formula order XG3Z6(BO3)3T6O18(OH,O)3(OH,F,O) where X = (Ca,Na,K,[]), g = (Mg,Li,Al,Mn,Fe2+,3+,V,Cr,Ti,Cu,[]), Z = (Al,Mg,Cr,V,Ti),Ti), T = (Si,Al,B,Be). Tourmaline crystallizes in the trigonal crystal system with rhombohedral lattice in elongated rods or needles with triangular section and curved faces.
Source Wikipedia