glauconite

a. A monoclinic mineral, 4[(K,Na)(Fe3+ ,Al,Mg)2 (Si,Al) 4 O10 (OH)2 ] ; mica group; basal cleavage; dull, light to dark green; soft; a common authigenic mineral in marine sediments, useful for radiometric ages for host rocks. Syn: greensandb. A general term applied to green hydrous silicates of potassium and iron. CF: celadonite
Source: Dictionary of Mining, Mineral, and Related Terms











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