Synthesis runs carried out at 750 degrees C/2000 bar (Mn (sub 0.3) to Mn (sub 1.8) ) and 650 degrees C/6000 bar (Mn (sub 2.0) to Mn (sub 2.3) ) led to essentially single-phase products. In contrast to natural amphiboles of similar composition, X-ray and optical properties that reflect long-range symmetry are consistent with space group Pnma. The cell volume and mean refractive index increase with increasing Mn-substitution. Chain multiplicity and chain arrangement faults. Mn-bearing analogs of chesterite and jimthompsonite. Structural and compositional inhomogeneity suggests that many synthetic amphiboles are poor experimental analogs of their natural counterparts.--Modified journal abstract.

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