This is a very rich specimen of dewindtite, dating to 1925 before it was even officially named, and the early era of exploration of this region by many great Belgian mineralogists. The label is noted WWI-era collector Robert Gage's, in his own hand. I showed this to Bill Pinch, to confirm its legitimacy, and he told me it is indeed one of the better example sof the species he has seen. A rare (if hot) treasure!