...Hiromi Konishi; Huifang Xu; Robert F. Dymek Abstract Jimthompsonite and chesterite occur as intergrowths within anthophyllite up to a few millimeters across in talc-magnesite schist from the ~3800 Ma Isua Supracrustal Belt, West Greenland. Pyribole lamellae span the entire intergrowth width...

...Hiromi Konishi; Peter R. Buseck; Huifang Xu; Xiaochun Li Abstract Proto-polymorphs of jimthompsonite and chesterite occur in metamorphosed serpentinites from two Japanese ultramafic complexes. The lattice constants of the proto triple-chain silicate, measured by X-ray diffraction, are a = 0.93605...

...D. R. Veblen; C. W. Burnham Abstract The crystal structures of jimthompsonite, clinojimthompsonite, and chesterite have been solved and refined using three-dimensional X-ray intensity data. Jimthompsonite and clinojimthompsonite contain I-beams composed of triple silicate chains and wide octahedral...

...John C. Schumacher; Michael Czank Abstract Pyriboles that consist of mixed double chains (anthophyllite), alternating double and triple chains (chesterite), and triple chains (jimthompsonite) coexist with phlogopite and Zn-rich spinel at Orijärvi, southwestern Finland. Each of these three pyribole...

...D. R. Veblen; P. R. Buseck Abstract High-resolution с -axis images of the biopyribole minerals anthophyllite [(Mg,Fe) 7 Si 8 O 22 (OH) 2 ], jimthompsonite [(Mg,Fe) 10 Si 12 O 32 (OH) 4 ], and chesterite [(Mg,Fe) 17 Si 20 O 54 (OH) 6 ] have been produced in the transmission electron microscope...

.... The cell parameters of the minerals are diagnostic: (1) jimthompsonite is orthorhombic, Pbca, a = 18.6, b = 27.2, с = 5.30A; (2) clinojimthompsonite is monoclinic, C 2/ c, a = 9.87, b = 27.2, с = 5.32A, β = 109.5°; (3) chesterite is orthorhombic, A 2 1 ma, a = 18.6, b = 45.3, с = 5.30A; (4) an unnamed...

... ∞ (pyroxenes), MP (amphiboles), M 2 P (jimthompsonite) and M 2 PMP (chesterite). The M module occurring in the series actually corresponds to talc but to keep consistency with Johannsen’s original definition it is identified with the letter M for mica, with the interlayer site omitted. These modules have been...

...Fig. 7 The structure of jimthompsonite in which the four Z 8 modules are shown. As in the case of sepiolite, the R 8 rods can be seen as composed by three R 2 rods (A, B, C) related by pseudo-partial mirror reflections, completed by additional atoms on the corresponding planes (blue...

...) with composition near that of talc, (Mg,Fe) 3 Si 4 O 10 (OH) 2 . The calculations were performed using results of the structure refinements of two orthopyroxenes (Opx), clinoenstatite (Cpx), twoampiboles (anthophyllite = An, cummingtonite = Cu), chesterite (Ch), jimthompsonite (Jt), clinojimthompsonite, and talc...