Optical Calcite from Madagascar

Sublime Optical Calcite from Madagascar.
 The most beautiful and pure pocket found in recent years!
 
 Size: 7 cm by 5 cm by 4 cm for 345gr
 Chemical formula: CaCO3
 Crystal system: Trigonal
 Hardness Mohs scale: 3
 
 Definition :
 Calcite is amineral composed of natural calcium carbonate.
 We can find Optical Calcite in Spheres or other cut objects .