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ottrelite

[o-truh-lahyt]
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noun Mineralogy.
  1. a brittle mica containing manganese and similar to margarite in physical and chemical properties.

Origin of ottrelite

1835–45; < French ottrélite, named after Ottrez, Belgium, where it is found; see -lite
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018