Smithsonite is a zinc carbonate and belongs to the same family that Calcite is in. It forms in globular masses, and as a pseudomorph will form layers that replaces the calcite. A pseudomorph, translating literally to "false form" happens when the existing crystal structure of one mineral is overtaken by another. 
 
In the sun this specimen has a dull druzy luster to it. Due to the smithsonite forming over the calcite crystals, you can still still their terminations all throughout the specimen. 
 
Smithsonite is a mineral known for intense relaxation and soothing individuals when they are at their breaking points. 
 
Weight: 2 pounds
Dimensions: 4.5" x 4" x 2"