Abstract
In recent years margarite has been recognized as an important rock-forming mineral in several widely distributed localities. This paper reports an occurrence of margarite pseudomorphs after chiastolite in metamorphosed black shales of the Rangeley area, Maine. Analyses are presented for coexisting margarite, muscovite, and chlorite. As with most reported analysis of margarite, a considerable amount of the paragonite end-member is present in solid solution (~28.4 mole %).
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