..., called sobralite, revealed its identity with pyroxmangite, a name which has four years’ priority over sobralite. A comparative study of pyroxmangite with rhodonite (both iron-rich and iron-poor varieties) shows distinct differences in the birefringence and axial angle. X -ray patterns indicate...

...N. Sundius Abstract The following minerals are generally regarded as triclinic pyroxenes: rhodonite, bustamite, fowlerite, iron rhodonite, sobralite, and pyroxmangite. All these mineral species represent metasilicates of manganese with smaller or greater admixtures of CaSiO 3 , MnSiO 3 and FeSiO 3...

... sobralite, pyroxmangite and vogtite to this triclinic group of minerals, but suggest that the group should not be regarded as pyroxenes. Copyright © 1927 by the Mineralogical Society of America 1927 Mineralogical Society of America ...

... < Fe are pyroxferroites, while those with Mn > Fe are pyroxmangites. Chao et al (1970) pointed out that terrestrial pyroxferroites were already reported from Sweden (Sundius, 1931) and Finland (Hietanen, 1938) but were described as sobralite' and ~ dark-br,?wn . pyroxmangite respectively. MnSi03 and FeSi03 0016 -7622/85/26-6-429/$ 1.00 © Geo...

... [around the Ca 0.5 (Fe,Mg) 0.5 SiO 3 point] and ‘sobralite’ [near the Mn 0.5 (Fe,Mg) 0.5 SiO 3 point; now pyroxmangite–pyroxferroite series minerals]. It should also be noted that the rhodonite field in the diagram by Sundius ( 1931 ) includes only two points corresponding to formulae (recalculated...