Andesine

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. To invest in Andesine : www.gemsinvestors.com