| 翻訳と辞書 |
amygdule
Amygdules or amygdales form when the gas bubbles or vesicles in volcanic lava (or other extrusive igneous rocks) are infilled with a secondary mineral such as calcite, quartz, chlorite or one of the zeolites. Amygdules usually form after the rock has been emplaced, and are often associated with low-temperature alteration. Amygdules may often be concentrically zoned. Rocks containing amygdules can be described as ''amygdaloidal''.
The word is derived from the Latin (''amygdala'') and Greek (''αμυγδαλή'') words for almond, reflecting the typical shape of an infilled vesicle.
"Amygdule" is more common in US usage, while "amygdale" is more common in British usage.
==Notes==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「amygdule」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|