Chemical,optical, and X-ray analysis of an unusual muscovite-biotite intergrowth |
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| Authors: | Randall L GresensHoward L Stensrud |
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| Institution: | Department of Geological Sciences, University of Washington, Seattle, Washington 98105, U.S.A. |
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| Abstract: | A specimen of intergrown biotite and muscovite from a pegmatite was subjected to detailed chemical, optical, and X-ray analysis. The crystals are intergrown in such a way that certain structural elements are common to both and that parts of the crystal structure must pass unbroken through the contact between them. Numerous ‘edge dislocations’ must occur at the boundary because of the different basal spacings. Partitioning of elements between the minerals, along with the structural observations, suggest that the crystals are an equilibrium intergrowth. |
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