Abstract
IN March, 1908, an unfamiliar mineral was discovered by Mr. W. G. Fearnsides in a narrow vein which traverses the intrusive granophyric mass of Tan-y-grisiau, near Ffestiniog, and was submitted to me for identification.
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THOMAS, H. Orthite in North Wales. Nature 81, 487 (1909). https://doi.org/10.1038/081487a0
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DOI: https://doi.org/10.1038/081487a0
