This is a pretty unique specimen of Blue Dolomite and Black Calcite from Colombia. Blue Dolomite is extremely rare as the stone itself does not form blue, rather it is clear dolomite with inclusions that make it blue. People aren't entirely sure what makes it blue since it is such an uncommon occurrence. This piece also has some black calcite growing with it, which is also not the most common color for calcite. This piece is truly one of a kind and would make a fine piece in any collection.
This piece measures approximately 12.8cm long x 11.4cm wide x 7.2cm tall