Mexican onyx

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Noun1.Mexican onyx - a hard compact kind of calciteMexican onyx - a hard compact kind of calcite  
calcite - a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone
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References in periodicals archive ?
The master bath has been substantially enlarged, with a glamorous tub clad in Mexican onyx.
On a trip to Mexico, I was informed that Mexican onyx puts kids to sleep.