Abstract
The studied, perfectly shaped Carlsbad twins from Loket (loc. swimming pool) are orthoclase perthites of low triclinicity (Δ=0.0–0.3); the sodic phase relates to low albite. All phenocrysts having zonal structure contain small areas of triclinic feldspars (Δ=0.6–0.8) independent on the zonality of low triclinicity. This microclinization is believed to be younger than the host orthoclase. The content of microcline within the phenocryst varies from about 10 to 30 percent.
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