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We describe the first documented case of {101̅0} twinning by reflection (or by twofold rotation about [100]) or merohedry (class II) in a member of the apatite supergroup. Twinning about [100] had previously been noted for the apatite supergroup but not confirmed. Pyromorphite crystals from Puech de Compolibat, Combret, Aveyron, France, were studied by single-crystal X-ray diffraction [a = 10.0017(19), c = 7.3413(16) Å, and V = 636.0(2) Å 3 , in P6 3 /m], where twinning was confirmed with the approximate twin fraction 62:38. Subsequent inspection of the morphology confirmed the nature of the twinning. The pyromorphite crystals are typically elongate and show the faces: (21̅1̅0), ( 2̅110), (0001), (0001̅), (101̅0), (1̅010), (101̅2̅), and (1̅012̅).

Twinning in pyromorphite: The first documented occurrence of twinning by merohedry in the apatite supergroup