Scientific Name: Plagioclase feldspars
Group: Silicates - tectosilicates
Chemical composition: (Na,Ca)Al2Si2O8
Colors: Peach, gold, brown
Formation: Triclinic crystal; massive form
Principal Sources: Southern Norway and Oregon, USA
Special Notes: Sunstone is a plagioclase feldspar, which when viewed from certain directions exhibits a brilliant spangled appearance. The optical effect appears to be due to reflections from inclusions of red copper which create schiller. It is the official gemstone of Oregon.