pegmatites
/P EH1 G M AH0 T AY0 T S/noun
- 1
A coarsely crystalline igneous or plutonic rock composed primarily of feldspar and quartz, normally with muscovite and/or biotite mica.
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Source: https://en.wiktionary.org/wiki/pegmatite, https://en.wiktionary.org/wiki/pegmatites