A type of chert used as an iron ore in parts of North America.
| 单词 | θ7023 |
| 释义 | the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > quartz > cryptocrystalline quartz > chert > others (1) taconite1905 A type of chert used as an iron ore in parts of North America. |
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