What is a borate of iron and magnesia, occurring in fibrous masses of a blackish green color called?
ludwigite — A borate of iron and magnesia, occurring in fibrous masses of a blackish green color. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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- Published: 2026-07-17T00:00:00-07:00 · Modified: 2026-07-17T00:00:00-07:00