| 单词 | greensand |
| 释义 | greensand [`grēn´sand] GEOLOGY A greenish sand consisting principally of grains of glauconite and found between the low-water mark and the inner mud line. MATERIALS A highly siliceous sand that contains small amounts of magnesia and alumina, with about 8% of its bulk in powdered coal or charcoal; dampened with water to make foundry molds. PETROLOGY Sandstone composed of greensand with little or no cement. |
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