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plural symplectites
(petrology, mineralogy) An intimate intergrowth of two or more different crystals, formed from the breakdown of unstable phases, consisting of minerals, ceramics, or metals. quotations
The Phe + Qtz symplectite, grown preferentially along the planar perthitic exsolution lamellae, indicates that the albite exsolution (i.e., a first retrogression) occurred before the eclogite-facies metamorphism […] .
2017, J. Theo Kloprogge, Robert Lavinsky, “Introduction: Geological Examples”, in Photo Atlas of Mineral Pseudomorphism, Amsterdam: Elsevier, page 88