metamorphic
Ruby in Zoisite
Anyolite (Al2O3 with Ca2Al3(SiO4)(Si2O7)O(OH))
AI-generated identification · may be incorrectHardness 6.5 to 9 on Mohs scale. Displays a distinctive combination of purplish-red ruby crystals embedded in a green zoisite matrix with black hornblende. Vitreous to greasy luster with an uneven fracture.
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Physical properties
Hardness 6.5 to 9 on Mohs scale. Displays a distinctive combination of purplish-red ruby crystals embedded in a green zoisite matrix with black hornblende. Vitreous to greasy luster with an uneven fracture.
Formation & geological history
Formed through intense metamorphic processes in high-grade metamorphic rocks when chromium-rich fluids interact with plagioclase-rich rocks.
Uses & applications
Widely used for ornamental carvings, decorative objects, and lapidary jewelry due to its striking contrasting colors.
Geological facts
First discovered in the Longido mining district of northeast Tanzania in 1954, anyolite is sometimes referred to as Tanganyika art stone.
Field identification & locations
Easily identified visually by the unique contrast of magenta-red corundum spots inside opaque green zoisite. Major commercial deposits remain primarily in Tanzania.
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