Adjective
Alt. of Petrographical
Source: Webster's dictionaryIt is helpful to have a petrographic microscope when using the Folk scheme, because it is easier to determine the components present in each sample. citation Dunham classification main The Dunham scheme focuses on depositional textures. Source: Internet
Related to crystal form, the quality of crystal faces is diagnostic of some minerals, especially with a petrographic microscope. Source: Internet
The different types of feldspar can be distinguished under a petrographic microscope. Source: Internet
The most commonly used classification of oil shales, developed between 1987 and 1991 by Adrian C. Hutton, adapts petrographic terms from coal terminology. Source: Internet