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Definition of framboid

A minute spheroidal grain of pyrite or an aggregate of such grains, commonly formed at low temperatures in oxygen-poor mud sediments containing organic matter, especially in marine mud deposits. First published use by Rust (1935). From the French framboise, "raspberry".

Bates, Robert L. and Jackson, Julia, eds. Dictionary of Geological Terms. Garden City, New York: Anchor Press/Doubleday, 1984.
Framboid. https://en.wikipedia.org/wiki/Framboid, accessed 1 March 2019.
Rust, G.W. (1935) Colloidal primary copper ores at Cornwall mines, southeastern Missouri. Journal of Geology, 43:398-426.

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