- Color: Red, Orangey Red, Orange, Yellow, color shift to Green
- Hardness: 6 - 6.5
- Refractive index: 1.55 - 1.56
- Density: 2.66 - 2.70
- Chemical composition: (Na,Ca)(Si,Al)4O8
- Crystal structure: triclinic
- Origins: Congo, Tibet.
Andesine belongs to the group - plagioclase feldspar. The red color is due to the presence of copper and is rare in gem quality stones. The best specimens are from Congo, with cherry-red and orangey-red crystals the most valuable.