What is a mineral of a dark brown color, generally with a fibrous, massive structure. It is a fluophosphate of iron and manganese called?
triplite — A mineral of a dark brown color, generally with a fibrous, massive structure. It is a fluophosphate of iron and manganese. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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