lepidomelane


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lepidomelane

(ˌlɛpɪˌdɒʊmɪˈleɪn)
n
(Geological Science) a black, ferruginous mica found in granite rock
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Noun1.lepidomelane - a mica that is a biotite containing iron
biotite - dark brown to black mica found in igneous and metamorphic rock
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1) has been known as a collecting locality for specimens of cancrinite, sodalite, nepheline, and lepidomelane (Fe-rich biotite).
Of note, Clark (1886) showed that biotite in this rock, long referred to as "lepidomelane," is high in both [Fe.sub.2][O.sub.3] (19.49 wt.%) and FeO (14.10 wt.%), low in MgO (1.01 wt.%), and completely lacking in Ti[O.sub.2].