pegmatite


Concise Oxford English Dictionary © 2008 Oxford University Press:
pegmatite /ˈpɛgmətʌɪt/
noun Geology a coarsely crystalline granite or other igneous rock with crystals several centimetres in length.
– origin C19: from Gk pēgma, pēgmat- ‘thing joined together’ + -ite1.
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