A good xample of grandidierite, this one is a crystal section that shows good crystal faces, though is not terminated.
In 2016 there was a rather spectacular find of this very rare blue-green borosilicate mineral in southern Madagascar. I has seen some available on my previous trip, but the quality was horrible-- they were basically formless shards, and few if any had crystal faces.
There was a little bit more available this time around, but once again, the majority were shards. Still, I looked through them and was able to obtain a small number of pieces that had visible crystal faces.