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Pronunciation varies by accent · noun
(mineralogy) A black or gray orthorhombic mineral form of manganese dioxide.
Use ramsdellite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Ramsdellite means (mineralogy) A black or gray orthorhombic mineral form of manganese dioxide.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use ramsdellite where its definition matches the intended context.
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