triphylite

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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 chemical composition of triphylite
Samuel Lewis Penfield

American Journal of Science March 1879, s3-17 (99) 226-229; DOI: https://doi.org/10.2475/ajs.s3-17.99.226
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On the chemical composition of triphylite from Grafton, New Hampshire
Samuel Lewis Penfield

American Journal of Science June 1877, s3-13 (78) 425-427; DOI: https://doi.org/10.2475/ajs.s3-13.78.425

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