An amorphous iron-rich mineral occurring as reddish- or yellowish-brown masses in phosphatic sedimentary rocks.
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| 单词 | θ7204 |
| 释义 | the world > the earth > minerals > types of mineral > phosphates > [noun] > calcium or iron phosphates (2) richellite1883 An amorphous iron-rich mineral occurring as reddish- or yellowish-brown masses in phosphatic sedimentary rocks. xanthoxenite1920 A hydrated basic phosphate of calcium and ferric iron, Ca4Fe3+ 2(PO4)4(OH)2·3H2O, occurring as yellow translucent triclinic crystals that are soft… |
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