Microcline is a common, but not a well known mineral and has been used as a semi-precious stone under the names of Amazonite and Perthite. Amazonite is a variety that is deep blue - green and is suitable for carving and polishing. The perthite variety is stripped, the colored stripes are microcline and the white or clear stripes are a plagioclase feldspar. If the Plagioclase than microcline it is called "antiperthite". Twinning is common in all feldspars. At some localities fine amazonite clusters are intermixed with smoky quartz crystals and this results in an outstanding classic mineral specimen.
This specimen as seen on the prospectors tv show. From the Smoky Hawk Claim Florissant, Teller County, Colorado. It really does have the bright colors shown in these pictures. One crystal has a small repair that doesn't show.