the GNU version of the Collaborative International Dictionary of English
n. A kind of mica related to muscovite, but containing soda instead of potash. It is characteristic of the paragonite schist of the Alps.
The Century Dictionary and Cyclopedia
n. A kind of mica, analogous to muscovite in composition, but containing sodium in place of potassium: it is characteristic of the paragonite-schist of the Alps.
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