This is a special Degrussa Mine from Australia 

Malachite crystal druzy polished cabochon.  

Amazing!

60mm by 33mm by 6mm

(24mm equals 1 inch)

‘DeGrussa Malachite Chrysocolla’ refers to a type of malachite chrysocolla gemstone that is specifically sourced from the DeGrussa copper mine in Western Australia, known for its beautiful blue-green color and often found in polished slabs with a high quality due to the unique geological conditions of the mine; essentially, it's a high-grade chrysocolla variety originating from the DeGrussa mine.