A ghostly sheen moves under the surface of this feldspar, like moonlight glowing in the water.

• Mineral: Feldspar
• Chemistry:  KAlSi3O8
• Color: Colorless to White, Gray, Green, Peach, Brown
• Refractive index: 1.518 to 1.526
• Birefringence: 0.05 to 0.008
• Specific gravity: 2.58
• Mohs Hardness: 6.0 to 6.5