The petrographical microscope is described in detail.
This petrographical study showed that "Mount Rainier is formed almost wholly of hypersthene andesite, with different conditions of groundmass and accompanied by hornblende and olivine in places.
The only other petrographical study of these volcanics is that of Mr. K.
Petrographical Notes on some rocks from the Fiji Islands,” Proceedings, American Academy of Arts and Sciences, vol.
The study, however, continued to be pursued in Germany, where the influence of Werner's enthusiasm still led men to enter the petrographical rather than the palaeontological domain.
This essay led to a complete revolution of petrographical methods and gave a vast impetus to the study of rocks.
In each region presenting a long chronological series of eruptive rocks a petrographical sequence can be traced, which is observed to be not absolutely the same everywhere, though its general features may be persistent.
In a slightly different arrangement from the above order of mention, the subdivisions of geology are as follows:— Subdivisions of Geology Petrographical Geology.
Here the science is founded upon mineralogy as well as chemistry, and a study of the rock materials of the earth is designated petrographical geology or petrography.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "petrographical" in a variety of sentences. We hope that you will now be able to make sentences using this word.
