1980
DOI: 10.1180/minmag.1980.043.330.13
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Spotted structures in gneiss and veins from Broken Hill, New South Wales, Australia

Abstract: SYNOPSISSPOTTED eye-like structures, made up of densely packed biotite 'pupils' mantled by quartz and feldspar, constitute about Io % by volume of a highgrade quartzofeldspathic gneiss located on the road to Purnamoota Homestead about IO km north of Broken Hill. These spotted structures have an uneven distribution within rocks exposed at this locality. In some parts of the outcrop they tend to be closely spaced ( fig. I), whereas elsewhere they are less abundant and the spotted gneiss merges into an essentiall… Show more

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