Tourmaline is a group of chemically stable silicate minerals whose crystals can reach large linear developments. Their color range is considerable. The colors of tourmalines depend on their chemical composition and on their impurities but also on their sensitivity to the radiation emitted by the granites.
The recently extracted tourmalines are kept on their natural bedrock which is often a quartz. With their long, multi-directional crystals and the beauty of their colors, nature has created works of art.
The four top lots have very dissimilar characteristics, to the delight of fans.
Blue on blue, lot 73105 estimated $ 500K, collected in 2001, is interesting by its two shades of blue but also because the growth of crystals in two contradictory ways, thin and stout, is a scientific curiosity.
Big beauty, lot 73100 estimated $ 450K, collected in 2006, is remarkable for the complexity of its colors and shapes.
Blastoff, lot 73114 estimated $ 450K, collected in 2004, includes six crystals, the longest measuring 18 cm. The two longest are perched like birds on their beautiful natural base of white cleavelandite.
The flower of Pederneira, lot 73099 estimated $ 300K, collected in 2000, offers an incredible network of secondary ramifications attached to the main crystal.