Concretions From the Champlain Clays of the Connecticut Valley
Concretions From the Champlain Clays of the Connecticut Valley
J M Arms Jennie Maria Arms Sheldon
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25 Manganese oxide 5. 44 Carbon dioxide . 25. No. 3 Silica 19. 28 Iron oxide ... 6. 16 Alumina . . . . 11. 19 Lime 28. 83 Magnesia .... 2. 39 Manganese oxide 5. 22 Carbon dioxide . 24. 50 No. 2 Silica 18. 74 Iron oxide ... 5. 89 Alumina .... 12. 59 Lime 28. 79 Magnesia .... 2. 40 Manganese oxide 5. 38 Carbon dioxide . 23. 69 No. 3 Silica 19. 18 Iron oxide ... 6. 04 Alumina .... 11. 30 Lime 29. 31 Magnesia .... 2. 32 Manganese oxide 5. 41 Carbon dioxide . 24. 57 No. 2 Silica 18. 64 Iron oxide . .... . Alumina .... Lime 28. 42 Magnesia .... 1. 78 Manganese oxide 5. 36 Carbon dioxide . 23;84 In this series the variation of carbon dioxide is 1. 5 per cent. Insoluble residue 26 per cent in the three concretions, variation less than 1 per cent. Silica, 19 per cent in two out of three specimens, variation less than 1 per cent. Manganese oxide constant 5 per cent. Iron oxide 6 per cent in two specimens, variation less than 1 per cent. Magnesium oxide 2 per cent, variation less than 1 per cent. Calcium oxide, variation 3 per cent, and aluminum oxide, variation 2 per cent.
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