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countable and uncountable, plural chlorites
(mineralogy) A dark green mineral resembling serpentine, being a mixed silicate of magnesium, iron and aluminium. quotations examples
They have been heated enough to impart a delicate blue-green hue, which is because of the abundance of the ‘low-grade’ metamorphic mineral, chlorite.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 177
(chemistry, countable) Any salt of chlorous acid. examples