Example Sentences

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Results from another technique known as petrographic testing, in which dyes are applied to samples of the concrete core to highlight any microscopic cracking, are still outstanding.

From Los Angeles Times • Nov. 14, 2023

Then we cut small blocks from the specimens, and from those we were able to prepare petrographic thin sections in three planes.

From Salon • Jun. 29, 2021

Because they polarize light, calcite crystals are used in special petrographic microscopes for studying minerals and rocks.

From Textbooks • Jan. 1, 2017

The Folk Classification deals with rock grains and usually requires a specialized, petrographic microscope.

From Textbooks • Jan. 1, 2017

These metamorphic phenomena, though important, are obscure, and their elucidation demands some knowledge of petrographic science, that branch of geology which considers the principles of rock formation.

From Outlines of the Earth's History A Popular Study in Physiography by Shaler, Nathaniel Southgate