Amblygonite Zimbabwe but it's the main crystal

but it's the main crystal that draws your attention

It certainly could be classified as a “cogwheel” piece

If you take it in the sun (even in a shaded area)

black and golden cyclic twinned crystal groups of Cassiterite sitting on white prismatic Quartz crystals

Amblygonite Zimbabwe but it's the main crystalAmblygonite is a relatively rare stone and is only found from a few localities in top gem material. Stones that approach five carats are highly sought after by collectors and deeply appreciated by those who have experience with rare gems. This particular stone has a light greenish color, and a "Round Brilliant" cut. With the naked eye, I cannot see any inclusions in this gem, which is impressive for the material, even in smaller gems. Amblygonite is