metamorphic

Zoisite with Rubellite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende (Anyolite)

AI-generated identification · may be incorrect

Hardness: 6-6.5; Color: Green with black inclusions; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 3.3

Hardness: 6-6
Color: Green with black inclusions
Luster: Vitreous to pearly

Identified July 21, 2026More metamorphic →

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Physical properties

Hardness: 6-6.5; Color: Green with black inclusions; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 3.3

Formation & geological history

Formed during the regional metamorphism of basic igneous, sedimentary, and metamorphic rocks. Most notable deposits are from the Precambrian era.

Uses & applications

Primarily used for ornamental carvings, cabochons for jewelry, and as a popular collector specimen.

Geological facts

Also known as Anyolite, from the Maasai word for 'green'. While it often contains red rubies, specimens like this one mostly show the green zoisite matrix and black hornblende.

Field identification & locations

Identified by its distinctive pistachio-green color peppered with black hornblende spots. Commonly found in Tanzania. Collectors value pieces with vibrant contrast.