One of the mysteries of the English language finally explained.
A green or greenish-blue mineral consisting of a hydrous silicate of magnesium, ferrous iron, and aluminium, and now usually regarded as a pseudo-trigonal variety of clinochlore.
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From German Pennin pennine + -ite. Apparently intended as an alternative term to pennine.
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