| 词汇 | aphanitic |
| 释义 | BETA Examples of aphaniticaphanitic isn’t in the Cambridge Dictionary yet. You can help! The upper parts of the ash beds generally are aphanitic and structureless, though locally they are interbedded with thin clay layers and exhibit ripple cross-stratification and planar lamination. The texture is often found in extrusive aphanitic, or glassy, igneous rock. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The hill is composed of aphanitic alkaline olivine basalt, with phenocrysts of olivine. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Examples of aphanitic igneous rock include basalt, andesite and rhyolite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There are six main types of textures; phaneritic, aphanitic, porphyritic, glassy, pyroclastic and pegmatitic. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Generally speaking, phaneritic implies an intrusive origin; aphanitic an extrusive one. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It has an aphanitic to porphyritic texture and is intermediate in composition between andesite and rhyolite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The individual crystals in an aphanitic igneous rock are not distinguisable to the naked eye. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Often, where the groundmass is aphanitic, chemical classification must be used to properly identify a volcanic rock. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Andesite is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In thin section, dacites may have an aphanitic to porphyritic texture. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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