marl·stone 
(märlstōn′)
(märlstōn′)n.
A rock containing clay materials and calcium and magnesium carbonates, with approximately the same composition as marl.
| 单词 | marlstone |
| 释义 | marl·stone (märlstōn′)n. A rock containing clay materials and calcium and magnesium carbonates, with approximately the same composition as marl. |
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