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Published online by Cambridge University Press: 01 May 2009
The solid and liquid states are defined on the basis of the viscosity-temperature curve.
Glasses are amorphous solids. Their state of molecular aggregation is fundamentally different from that of liquids: they are not super-cooled liquids.
It is suggested that porphyritic texture may result from an even rate of magmatic cooling on account of the abnormal increase in viscosity which occurs before vitrifaction.
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