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  • All fields: pyrolusite
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Display: 20

    • Concretions

    • Geology; Concretions
    • "7. Sand concretion Sioux Co., Nebr. Vol. I Pl. VIII. Nebr. Surv. Rept. 9. Ball of pyrolusite Cheyenne Co., Nebr. Vol. I. PL. VIII Surv. Rept. 10. Same as 9 broken to show radiate structure. Vol. I Surv. Rept. Plate VIII." Ten concretions...

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