This transparent quartz has colors of both amethyst and citrine and is called ametrine or amethyst-citrine.

• Mineral: Quartz
• Chemical composition: SiO2
• Color: Bicolor orange/yellow and purple
• Refractive index: 1.544 to 1.553
• Specific gravity: 2.66 (+0.03/-0.02)
• Mohs hardness: 7