Century Dictionary and Cyclopedia
- n. In petrography, a name applied by Wadsworth (1887) to diabasic glasses. Same as sordavalite.
- n. A rare mineral containing zirconium, titanium, thorium, iron, and calcium. It occurs in black octahedral crystals at Jacupiranga, Brazil.
- Ferdinand Zirkel (1838-1912), German petrographer, and -ite. (Wiktionary)
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