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/ˈpɛɡmətaɪt/ · noun
A coarsely crystalline igneous or plutonic rock composed primarily of feldspar and quartz, normally with muscovite and/or biotite mica..
Use pegmatite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Pegmatite means A coarsely crystalline igneous or plutonic rock composed primarily of feldspar and quartz, normally with muscovite and/or biotite mica..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use pegmatite where its definition matches the intended context.
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