PIETERSITE CHARACTERISTICS Origin of the name: From the man who discovered it, Sidney Pieters. Chemical Composition: Complex silicate, SiO2. Hardness: 7 Crystal system: Rhombohedral Deposits: South Africa, China, Namibia. Color(s): Blue, Yellow, Orange, Brown. History and Legends: Lithotherapy Properties: Physical Properties: Signs of the zodiac: Chinese signs: Chakra: