His chief work was in microscopic petrology, to the study of which he was attracted by the investigations of Dr H.
Here you find articles in the encyclopedia on topics related to petrology.
It is, however, a hornblende granite and does not possess the mineralogical composition of the syenites of modern petrology.
AA'ecv, to split), in petrology, metamorphic rocks which have a fissile character.
IrXivOos, a tile), in petrology, a dark grey or dark brown crypto-crystalline substance which has an almost vitreous lustre, and when pure appears structureless to the unaided eye.