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Definition of Cologne earth
1. Noun. (mineralogy) An earth of a deep brown colour, containing more vegetable than mineral matter; an earthy variety of lignite, or brown coal. ¹
¹ Source: wiktionary.com
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1. Noun. (mineralogy) An earth of a deep brown colour, containing more vegetable than mineral matter; an earthy variety of lignite, or brown coal. ¹
¹ Source: wiktionary.com