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Pronunciation varies by accent · noun
(mineralogy) A fibrous neosilicate mineral, polymorphic with andalusite and kyanite, with the chemical formula Al₂SiO₅..
Use sillimanite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sillimanite means (mineralogy) A fibrous neosilicate mineral, polymorphic with andalusite and kyanite, with the chemical formula Al₂SiO₅..
Common synonyms include bucholzite, fibrolite.
The opposite depends on the specific sense.
Use sillimanite where its definition matches the intended context.
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