Society of Glass Technology · [Sheffield] · leaf 609
t temperatures approaching the meltingpoint of silica cristobalite was the stable form, was strongly con-firmed by the evidence obtained. It appeared clear that, on super-cooling, the unstable phase often crystallised first and underwentrapid growth in the dendritic form. Crystals of tridymite, on… … FeO,SiOa MnO.SiO- iFeO.SiO! lMnO, Si 0, Fig. 150. quent growth. The characteristics of other minerals found, suchas fayalite, the orthosilicate of iron, 2FeO,Si02, and tephroite, thecorresponding isomorphous manganese silicate, of the olivine group,and silicates of the rhodonite group such as…
Glass
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