groundmass
groundmass — 名詞
1. in a porphyritic rock, the small-grained or glass-like material surrounding the
基質；石基
斑狀岩中包圍大顆晶體的細粒基底
in a porphyritic rock, the small-grained or glass-like material surrounding the larger crystals you can see with the naked eye.
Under the microscope, Samir saw bright crystals of quartz set in a dark groundmass.
在顯微鏡下，Samir 看見明亮的石英晶體鑲嵌在深色的基質之中。
collocation: set in a (dark/fine) groundmass
The groundmass of this lava sample is so fine that it looks almost like glass.
這塊熔岩樣本的基質非常細，看起來幾乎像玻璃一樣。
pattern: the groundmass of [rock sample] is [texture]
Tariq's students learned to tell the large crystals from the surrounding groundmass.
Tariq 的學生學會辨別大顆晶體與周圍的石基。
In many volcanic rocks, the groundmass cooled quickly and never formed visible crystals.
許多火山岩的基質冷卻太快，因此沒有形成肉眼可見的晶體。
typical geology context: cooling rate vs. crystal size
Ife pointed at the pink feldspar grains floating in a pale grey groundmass.
Ife 指著漂浮在淺灰色基質中的粉紅色長石顆粒。
- fine-grained groundmass
- glassy groundmass
- dark groundmass
- set in a groundmass
- the groundmass of the rock
- matrix
broader term used across petrology and sedimentology; groundmass is reserved for the fine material around phenocrysts.
- mesostasis
the very last material to crystallise between earlier crystals; a narrower technical subset of the groundmass.
- phenocryst
the large visible crystals embedded WITHIN the groundmass — the contrasting component, not the same field of view.
文法句型
the groundmass of [rock type]
用法筆記
Almost always uncountable and used in petrology or igneous-rock contexts. Subject of the surrounding sentence is usually a rock sample, thin section, or specimen rather than a person.
常見錯誤
常見搭配
名詞搭配
- groundmass texture
- groundmass crystals
- groundmass composition
常用片語
- set in a fine-grained groundmass
- the groundmass of the rock
介系詞搭配
- in a groundmass
- of the groundmass