metamorphic

Polished ruby-in-zoisite (anyolite), probable

Ruby-bearing zoisite; zoisite Ca₂Al₃(SiO₄)₃(OH), with corundum Al₂O₃

AI-generated identification · may be incorrect

Small polished cabochon with dark green, opaque-to-translucent zoisite and vivid pink-red ruby inclusions. Zoisite has Mohs hardness 6–7 and vitreous luster; ruby is hardness 9, with no cleavage and trigonal crystal structure. Exact identification is visual and would benefit from testing.

Identified September 15, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed by regional metamorphism of aluminum-rich rocks, commonly in East African metamorphic terrains; notable material comes from Tanzania and Kenya. The geological age varies by deposit, commonly Precambrian.

Uses & applications

Used for cabochons, carvings, beads, and mineral specimens; attractive pieces have modest jewelry value. Green zoisite is also used decoratively, while ruby inclusions provide color contrast.

Geological facts

The trade name “anyolite” generally refers to ruby-bearing green zoisite, especially Tanzanian material. Ruby may appear as pink, red, or purplish patches rather than transparent gem crystals.

Field identification & locations

Identify by the green matrix, contrasting pink-red ruby, opaque appearance, and relatively soft polish compared with ruby. Common sources include Tanzania, Kenya, and occasionally Norway; hardness, streak, and magnification can help distinguish it from dyed jade or glass.