"Goldstone" is quite often reffered to as "Sunstone". Goldstone is a manufactured stone, whereas Sunstone is natural.
Mineral Species: Silicates
Chemical Formula: (NaAlSi3O8 - CaAl2Si2O8)
Mohs Scale Hardness: 6 - 6.5
Location: India
Typical Appearance: Orange / Brown with bright flakes.