Sunstone has a Triclinic crystal system and is in the mineral class of lattice silicate, the feldspar family. Its orange to brown appearance comes from microscopically thin Hematite platelets. The mineralogical term for Sunstone is Aventurine Feldspar which unfortunately, many times leads to it being confused with the green Aventurine Quartz.
While it is found in many places around the globe, some of the finest examples come from Norway. The Sunstones I offer have come from there. Their mixture of sodium and calcium aluminum silicates have quite beautifully encased the Hematite inclusions that so brilliantly reflect and flash from one plane to another.