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lepidomelane
lepidomelane n.
Brit. 
/ˌlɛpᵻdə(ʊ)məˈleɪn/
, /ˌlɛpᵻdə(ʊ)məˈleɪn/U.S. /ˌlɛpədoʊməˈleɪn/
[ < Greek μέλας, μέλανος black] Mineralogy a highly ferruginous mica, usually found in aggregations of small black scales./ˌlɛpədoʊməˈleɪn/ΚΠ
1844 J. D. Dana Syst. Mineral. (ed. 2) 322 Lepidomelane..was named in allusion to its structure and color.
1879 F. Rutley Study of Rocks x. 136 Lepidomelane occurs in small disc-sided tabular crystals, or in aggregations of minute scales.
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as lemmas