metamorphic
Tumbled ruby-in-zoisite (likely)
Ruby-bearing zoisite; zoisite Ca₂Al₃(SiO₄)₃(OH), corundum ruby Al₂O₃
AI-generated identification · may be incorrectRounded and polished, with mottled green-gray zoisite, pink-red ruby, and dark inclusions. Zoisite has Mohs hardness 6–7; ruby is 9, with vitreous to subvitreous luster and no prominent cleavage.
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Physical properties
Rounded and polished, with mottled green-gray zoisite, pink-red ruby, and dark inclusions. Zoisite has Mohs hardness 6–7; ruby is 9, with vitreous to subvitreous luster and no prominent cleavage.
Formation & geological history
Forms during regional metamorphism of aluminum- and calcium-rich rocks, commonly in Precambrian metamorphic terranes; notable deposits formed in Tanzania. The exact specimen cannot be confirmed from a photograph alone.
Uses & applications
Used as a lapidary and collector stone; attractive pieces are made into cabochons, carvings, and beads. Ruby-in-zoisite is generally ornamental rather than a major industrial material.
Geological facts
The red areas are ruby, while green zoisite commonly contains black hornblende or tschermakite inclusions. It is often marketed under trade names such as anyolite, though anyolite strictly refers to a specific ruby-zoisite rock.
Field identification & locations
Identify by the contrasting red ruby and green zoisite in a polished aggregate; test cautiously because hardness varies between grains. Common sources include Longido, Tanzania, India, and Madagascar.
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