• journal_title：Mineralogical Magazine
• Contributor：L. Secco ; F. Nestola ; A. Dal Negro
• Publisher：Mineralogical Society of Great Britain and Ireland
• Date：2008-
• Format：text/html
• Language：en
• Identifier：10.1180/minmag.2008.072.4.987
• journal_abbrev：Mineralogical Magazine
• issn：0026-461X
• volume：72
• issue：4
• firstpage：987
• section：Articles

Three natural crystals of the wulfenite (PbMoO₄)–stolzite (PbWO₄) series were investigated by single-crystal X-ray diffraction. The results indicate that the symmetry is I4₁/a from nearly pure wulfenite to intermediate compositions, in contrast to previous work which claimed a symmetry change to I4̅ symmetry (acentric) for intermediate compositions compared with I4₁/a (centric space group) for the end-members. The results reported here show that the reflections violating I4₁/a symmetry observed in this work and in a previous study are related primarily to λ/2 effects, even if Renninger effects are not excluded. Consequently, we find that the I4₁/a symmetry is retained throughout the wulfenite– stolzite series.