Indigolite Blue Tourmaline with Brazilian Quartz

Indigolite blue tourmaline gemstone with Quartz on matrix from Araçuaí, Minas Gerais, Brazil.
 
 Rare and sublime piece!
 Size: 10 cm by 6.5 cm by 4 cm for 313 gm
 
 Wikipedia definition:
 The word tourmaline designates a group of minerals from the silicate family, a subgroup of cyclosilicates. Tourmaline crystallizes in the trigonal crystal system with a rhombohedral lattice in elongated rods or needles with triangular section and curved faces.