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Hyalopilitic : ウィキペディア英語版 | Hyalopilitic
Hyalopilitic is a textural term used in petrographic classification of volcanic rocks. Specifically, hyalopilitic refers to a volcanic rock groundmass, which is visible only under magnification with a petrographic microscope, that contains a mixture of very fine-grained mineral crystals either mixed with natural volcanic glass, or surrounded by thin bands of volcanic glass. ==See also==
* List of rock textures * Rock microstructure * Obsidian
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