English)

petrographic [Brit pɛtrəˈɡrafɪk, Am ˌpɛtrəˈɡræfɪk] ADJ

petrographic

petrografico

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petrographic

English

When viewed in thin section with a petrographic microscope, it is white-gray with pale green pleochorism in plane-polarized light. en.wikipedia.org

It is hard, dense, black and usually idiomorphic, with a red-brown pleochroism in petrographic thin section. en.wikipedia.org

More recently, on the basis of field, petrographic, and textural observations, it is argued that these geological structures are not extraterrestrial impact craters. en.wikipedia.org

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