phosphates

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Effect of the mutual replacement of manganese and iron on the optical properties of lithiophilite and triphylite
Samuel Lewis Penfield and J. H. Pratt

American Journal of Science November 1895, s3-50 (299) 387-390; DOI: https://doi.org/10.2475/ajs.s3-50.299.387
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On the crystallization of herderite
Samuel Lewis Penfield

American Journal of Science May 1894, s3-47 (281) 329-339; DOI: https://doi.org/10.2475/ajs.s3-47.281.329
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Variscite from Utah
Robert Lawrence Packard

American Journal of Science April 1894, s3-47 (280) 297-298; DOI: https://doi.org/10.2475/ajs.s3-47.280.297
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On the chemical composition of staurolite and the regular arrangement of its carbonaceous inclusions
Samuel Lewis Penfield and J. H. Pratt

American Journal of Science February 1894, s3-47 (278) 81-89; DOI: https://doi.org/10.2475/ajs.s3-47.278.81
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Mineralogical notes
William Earl Hidden

American Journal of Science October 1893, s3-46 (274) 254-257; DOI: https://doi.org/10.2475/ajs.s3-46.274.254
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Notes on the geology of Florida; two of the lesser, but typical phosphate fields
Lawrence Clement Johnson

American Journal of Science June 1893, s3-45 (270) 497-503; DOI: https://doi.org/10.2475/ajs.s3-45.270.497
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Mineralogical notes
Samuel L. Penfield

American Journal of Science May 1893, s3-45 (269) 396-399; DOI: https://doi.org/10.2475/ajs.s3-45.269.396
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On herderite from Hebron, Me
Horace Lemuel Wells and S. L. Penfield

American Journal of Science August 1892, s3-44 (260) 114-116; DOI: https://doi.org/10.2475/ajs.s3-44.260.114
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On the influence of swamp waters in the formation of the phosphate nodules of South Carolina
Charles L. Reese

American Journal of Science May 1892, s3-43 (257) 402-406; DOI: https://doi.org/10.2475/ajs.s3-43.257.402
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Turquois in southwestern New Mexico
Charles H. Snow

American Journal of Science June 1891, s3-41 (246) 511-512; DOI: https://doi.org/10.2475/ajs.s3-41.246.511

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