Assertion: compound's composition | /r/CapableOf | exsolve to two feldspars
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Source sentences:
text: Intermediate compositions of plagioclase feldspar also may exsolve to two feldspars of contrasting composition during cooling, but diffusion is much slower than in alkali feldspar, and the resulting two-feldspar intergrowths typically are too fine-grained to be visible with optical microscopes.