The nuclei of pleochroic haloes

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ID: 300081
1947
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Abstract
Nuclei of pleochroic haloes in biotite from New Zealand granites are monazite, xenotime, occasionally apatite, but never zircon. Optical data for monazite, alpha 1.787, gamma 1.839, 12V 2-14 degrees , are comparable to that for monazite in nearby sands containing U ~3~ O ~8~ 1.23 percent and ThO ~2~ 2.32 percent. It is uncertain whether the apatite radioactivity is due to U or Th replacing Ca in the crystal lattice or to radioactive mineral inclusions. U and Th in the lattice of monazite and xenotime appears to result from similarity in size of the Y, Th, and U ions; the smaller size of the Zr ion allows limited substitution.
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openalex_W2333430032 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors C. O. Hutton
Journal american journal of science
Year 1947
DOI
10.2475/ajs.245.3.154
URL
https://ajs.scholasticahq.com/article/61142.pdf
Keywords Keywords not found

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