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/ˈɡɹeɪ.wak.ə/ · noun
(geology) A hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix..
Endless bleak, rounded hills composed of shales and ribs of tough ‘greywackes’ make up the Southern Uplands – all of such rocks were originally deposited under marine conditions.
Use greywacke when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Greywacke means (geology) A hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Endless bleak, rounded hills composed of shales and ribs of tough ‘greywackes’ make up the Southern Uplands – all of such rocks were originally deposited under marine conditions.
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