Tourmaline - Minas Gerais, Brazil
 
 The 5.7 cm high crystal has a bluish color that changes to an intense moss green towards the top. Depending on the incidence of light, the green shows up in a wide variety of gradations from dark to light. Despite the fanned-out surface structure, the piece has a good lustre. 
 Interesting specimen that belonged to the Robert Scheck collection.