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schist
This term describes a specific geological texture where minerals are aligned in parallel planes, allowing the rock to be cleaved into plates. It is distinguished from gneiss by its finer grain and from slate by its more visible, shimmering mineral crystals, often giving the rock a characteristic metallic luster.
As a mass noun referring to a type of 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, such as different varieties of schist found in a region.
Ý nghĩa
Ví dụ
The mountain range is primarily composed of ancient schist.
Look at how this schist splits into thin sheets.
The walls of the old cottage were built from local schist.
I wonder if this sample is actually schist or just a fine-grained gneiss.
The silver-grey sheen of the schist shimmered under the flashlight.
We found a large deposit of blue schist near the valley floor.
The geologist pointed to the foliated layers of the schist.
This particular type of schist is common in the Appalachian region.