One of the mysteries of the English language finally explained.
1Mineralogy. Any of several green copper minerals, especially when used as a pigment; specifically (a) malachite; (b) chrysocolla; (c) glauconite.
2The dark green colour of various copper minerals or of mountain vegetations.
Early 18th century; earliest use found in Ephraim Chambers (?1680–1740), encyclopaedist. From mountain + green, after German Berggrün.
mountain green/ˌmaʊntɪn ˈɡriːn/
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