Figure 7
Variation in selected bond lengths and angles from …–Pb2–O3–B–O3–Pb2–… atom chains and (Pb1–O6)–(BO4) polyhedral with chemical composition of the minerals from the pyromorphite–mimetite series: (a) variation in selected bond lengths, (b) variation in selected bond angles, (c) variation in the metaprism twist angle φ in O1—Pb1—O2, defined by White & ZhiLi (2003). |