A very rare (and decently large, for any locality) cassiterite crystal from a pegmatite locality in Afghanistan.  I have seen a few examples from Pakistan, but never one from Afghanistan-- in fact, Mindat only has photos of 5 examples. The crystal is not perfect: it has a decently sized chip on the lower center, though it actually somewhat blends in with the ridged surfaces of the rest of the crystal. The overall form is great, and it sits perfectly atop an albite matrix... and you will almost certainly NOT find another Afghan example of this magnitude.