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trachyte
This term is used exclusively within the specialized register of geology and petrology. It describes a specific type of volcanic rock, and its usage is restricted to technical descriptions of mineral composition and rock textures.
As a mass noun referring to a geological material, it is typically treated as uncountable when discussing the substance in general. However, it can be used as a countable noun when referring to specific types or samples of the rock.
Meanings
Examples
The geologist identified the sample as trachyte based on its high alkali feldspar content.
Look at this outcrop, it is clearly a layer of trachyte.
Trachyte often forms steep-sided volcanic domes during eruptions.
I wonder if this specimen is actually trachyte or just a similar rhyolite.
The porphyritic texture of the trachyte indicates a complex cooling history.
We found a significant deposit of trachyte near the ancient caldera.
Is this rock trachyte? It looks too coarse to be a typical sample.
The cliff face consists primarily of weathered trachyte and tuff.