Kaolinite ps. Orthoclase

A classic Cornwall pseudomorph: kaolinite and fine-grained muscovite ("sericite") have replaced Carlsbad law twinned orthoclase in what has locally been nicknamed a "pig's egg." The specimen shows surface pitting (which is typical of this replacement) and has some damage, including a missing "ear" on the bottom. There is minor associated muscovite.

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