Regressions of physical properties on the compositions of clinopyroxenes; Part 2, Optical properties and specific gravity

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ID: 308478
1961
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Abstract
New regression coefficients of 5 physical properties (n ~x~ , n ~y~ , n ~z~ , Z/c, and G) on 15 variables of chemical composition in clinopyroxene \[ABC ~2~ O ~6~ = (K, Na, Ca, Mn, Fe, Mg) (Mn, Fe, Mg, Ti, Fe999, Al) (Fe999, Al, Si) ~2~ O ~6~ \], calculated by least squares from data in 155 selected published descriptions, yield new \"best\" estimates of the values of these properties for important compositions; the estimates of refractive index are statistically accurate to + or - 0.005 or better at the 90% confidence level for all principal \"end members\" except johannsenite and jadeite, for which data are insufficient, or of insufficient accuracy. The standard deviations decrease as the composition approaches the over-all mean composition of the specimens used, reaching an optimum of + or - 0.0008 for the refractive indices of the mean. Best values and standard deviations for some \"end members\" are given. The remarkable success of the regressions in predicting optical properties of clinopyroxenes lends support to the hypothesis of linear, additive variation of these properties throughout the entire clinopyroxene system and thus to the suggestion that the system should be described as a single unit.
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openalex_W2090899811 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Horace Winchell
Journal american journal of science
Year 1961
DOI
10.2475/ajs.259.4.295
URL
https://ajs.scholasticahq.com/article/58868.pdf
Keywords Keywords not found

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