Twinning is the observed intergrowth of multiple crystals in a symmetrical fashion. This term applies to the examination of rock thin sections, in the field of optical mineralogy.
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Index Fossil
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Concrete Gravity Dam
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Volcanic Rock (Igneous)
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Soil Creep
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Body-Wave Magnitude
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“Test” Definition in Paleontology
In the field of paleontology, a subsidiary of geology, the term “test” refers to the external hard part of an invertebrate.
