 | | Book (edition) | | described by A. N. Winchell in 1900 and named " pigeonite " (from Pigeon Point, Minnesota); it has now become...of smaller axial angle than this being called pigeonite, all others augite; but H. H. Hess has given reasons...limit 2V = 32°. T. F. W. Barth (2) contends that pigeonite is only formed under conditions of rapid cooling...crystallize separately, as in gabbro and norite pigeonite is therefore regarded as a metastable mineral...(diopside-hypersthene). maintains that iron-rich pigeonite is conditions. D. The Soda-Diopside substitution |  | | Book (edition) | | described by A. N. ,vinciiell in 1000 and named "pigeonite 11 (from Pigeon Point, Minnesota); it has now...of smaller axial angle than this being called pigeonite, a11others augite. This limit corresponds roughly...1, or Di,EniT. F. W. Barth (2) contends that pigeonite is only formed under conditions of rapid cooling...crystallize separately, as in gabbro and norite; pigeonite is therefore regarded as a metastabl~ mineral...(diopside-hypersthene). But H. Kuno maintains that iron-rich pigeonite is stable even under pltitonic conditions. • D |
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