metamorphic
Zoisite with Ruby (Anyolite)
Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)
Hardness: 6-6.5 (Zoisite) to 9 (Ruby); Color: Green with black speckles; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 3.2-3.5
- Hardness
- 6-6
- Color
- Green with black speckles
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 (Zoisite) to 9 (Ruby); Color: Green with black speckles; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific Gravity: 3.2-3.5
Formation & geological history
Formed through regional metamorphism of igneous, sedimentary, and metamorphic rocks. This specific combination is typically found in high-grade metamorphic environments such as amphibolite facies.
Uses & applications
Primarily used for lapidary work including ornamental carvings, cabochons, and beads for jewelry. It is also a popular specimen for mineral collectors.
Geological facts
Also known as Anyolite, which is derived from the Maasai word 'anyoli' meaning green. While it contains Ruby, it is usually not gem-quality and is appreciated more for the contrast between the green zoisite and black pargasite inclusions.
Field identification & locations
Identify by its distinctive bright 'pistachio' green color and black inclusions of pargasite hornblende. Commonly found in Tanzania (Longido district). To identify in the field, look for the high density and the specific lime-green hue.
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