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Pronunciation Guide
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Listen to native speakers pronounce “greywacke” in real conversational contexts with synchronized timestamps and subtitles.
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.”