- megacryst
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Any crystalline grain in an igneous or metamorphic rock that is much larger than those of the surrounding matrix
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megacryst
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Megacryst — In geology, a megacryst is a crystal or grain that is considerably larger than the encircling matrix. They are found in igneous and metamorphic rocks.[1] References ^ Glossary of terms . Memphis Archaeological and Geological Society. 7 April 2006 … Wikipedia
Cornubian batholith — Map showing the main granite outcrops of the Cornubian batholith in southwest England and the location of Haig Fras the 20 mGal Bouguer anomaly is also shown as this indicates the location of the negative anomalies associated with these… … Wikipedia
Rock microstructure — includes the texture of a rock and the small scale rock structures. The words texture and microstructure are interchangeable, with the latter preferred in modern geological literature. However, texture is still acceptable because it is a useful… … Wikipedia
Mount Noorat — is an extinct volcano, situated on Glenormiston Road north of the township of Noorat, and approximately six kilometres north of Terang, Victoria, Australia. [1] The last eruption is estimated to have occurred between 5,000 and 20,000 years… … Wikipedia
macrocryst — noun A relatively large crystal occurring in a mineral deposit, usually defined as one between 0.5 mm and 10 mm in size. See Also: megacryst, microcryst, phenocryst, xenocryst … Wiktionary
