Winchite from Mt. Hiei contact aureole, Kyoto, Japan

Takao HIRAJIMA; Daisuke NAKAMURA; Katsushi SHIRAHATA

doi:10.2465/jmps.95.107

Abstract

Sodic-calcic amphibole closely associated with aegirine-augite was newly found from a sandy hornfels at Mt. Hiei contact aureole, Kyoto, Japan. The amphibole shows a pleochroism of X=colorless, Y=blue and Z=light blue and is winchite with significant amounts of TiO₂ (1.5-2.5 wt.%) and of Mg-Fe-Mn-Li amphibole component at B site (ca. 0.1-0.4 cations for O=23 basis). The chemical composition and the coexisting phases of the winchite in this study are similar to those in the alkaline igneous complex.

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