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Glossary of Terms
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Pearly luster
Exhibiting a luster similar to the inside of a mollusk shell or shirt button. Many micas exhibit a pearly luster, and some minerals with a pearly luster have an iridescent hue. Some minerals may exhibit a pearly luster on cleavage cracks parallel and below the reflecting surface of a mineral.



Biotite Mica with a Pearly Luster



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