New data on zoisite and epidote

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ID: 295960
1966
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Abstract
Zoisite (beta -zoisite) is iron-poor, and ferrian zoisite (alpha -zoisite) is iron-rich. With increasing ferric iron content the optic angle 2V ~z~ appears to vary from about 60 degrees through 0 degrees to 70 degrees with concomitant change of optic plane orientation from (010) to (100). Study of 20 epidotes from greenschist, blueschist, and almandine amphibolite facies rocks has shown that they are similar in major-element composition to hydrothermal epidote. Their X-ray unit cell parameters are in substantial agreement with regressions based on hydrothermal epidote, and the (020) X-ray determinative curve appears applicable to epidote from a wide range of geologic environments. Mineral assemblages containing both zoisites appear limited to layered calc-silicate rocks in the middle almandine amphibolite facies. These minderals probably represent equilibrium assemblages in these rocks
Reference Key
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Authors G. H. Myer
Journal american journal of science
Year 1966
DOI
10.2475/ajs.264.5.364
URL
https://ajs.scholasticahq.com/article/59131.pdf
Keywords Keywords not found

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