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Group: Silicates - orthorhombic
Chemical composition: Ca2Al3(SiO4)3(OH)
Colors: Green, rose, red, blue, violet, brown
Hardness: 6.5 to 7
Principal Sources: Worldwide
Special Notes: Ruby in zoisite is also known as anyolite. Zoisite, the same mineral as tanzanite, provides an earthy green and black color while ruby lends pink and red highlights. Named in honor of the discoverer, the Austrian natural scientist Baron Siegmund von Zoi