MATERIAL: Green Tourmaline, Chromium/Vanadium crystal in matrix. CONDITION: Very good condition. Size: 1,8 inch (46 mm) x 1,4 inch (36 mm) x 1,4 inch (35 mm). Tourmaline is a rare stone in mineralogy, the only natural crystal in the world, quite often it is endowed with magical properties. It is of great importance for the human body. Even in antiquity, tourmaline was called the stone of poets, there was even a legend that the stone made its way from the bowels of the earth to the rainbow and absorbed all its colors. The Romans attributed the crystal to relaxing properties, it was believed that it calms the nerves and helps you fall asleep.