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Pronunciation varies by accent · noun
(mineralogy) A grey-black monoclinic mineral containing astatine, lead, sulphur and thallium..
Use richardsollyite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Richardsollyite means (mineralogy) A grey-black monoclinic mineral containing astatine, lead, sulphur and thallium..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use richardsollyite where its definition matches the intended context.
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