LAPIS LAZULI CABOCHON
A Lapis Lazuli Cabochon with good blue colour. Polished ready for jewellery making. Great for pendant jewellery making with silver.
4.1cm x 3.1cm x 0.96cm, 23g.
Lazurite Na6Ca2(Al6Si6O24)(SO4,S,S2, S3,Cl,OH)2
Lapis lazuli or ‘lapis’ for short is mostly lazurite but commonly contains pyrite and calcite and some other minerals. The name means “blue rock” and is always a brilliant blue with violet or greenish tints. The rich blue color is due to the sulfur that is inherent in the structure of lazurite. Small crystals of pyrite are always present in lapis and their brassy yellow color is both attractive and diagnostic in distinguishing lapis from its also blue cousin Sodalite, which lacks pyrite.