My pleasure!
Lakeview, Oregon: Sunstone (Feldspar) Gem Mines
The arid south-central portion of Oregon is a classic volcanic region. There the relatively young rock consists of dark basalts, andesites, rhyolites, ash and cinders. Millions of years ago a magma chamber several miles below the surface supported the correct geochemical conditions for the growth of labradorite, a calcium-rich plagioclase feldspar. ... http://www.mtlilygems.com/mineinfo/plshinfo.html
The Yellowstone hot pocket?