metamorphic
Ruby-in-zoisite beads (anyolite)
Ruby (corundum, Al₂O₃) in zoisite (Ca₂Al₃(SiO₄)₃(OH)); often with black hornblende
AI-generated identification · may be incorrectPolished, opaque beads with mottled green, pink-red, and black patches. Zoisite has Mohs hardness 6–7 and vitreous to dull luster; ruby is hardness 9, trigonal, and may show vitreous luster. The beads’ round shape and holes indicate lapidary processing.
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Physical properties
Polished, opaque beads with mottled green, pink-red, and black patches. Zoisite has Mohs hardness 6–7 and vitreous to dull luster; ruby is hardness 9, trigonal, and may show vitreous luster. The beads’ round shape and holes indicate lapidary processing.
Formation & geological history
Forms through metamorphism of aluminum-rich rocks, producing ruby crystals in a zoisite-rich matrix. Most familiar material comes from Tanzania; the age varies with the host rock and deposit.
Uses & applications
Used for beads, cabochons, carvings, and ornamental objects; attractive contrast makes it popular in affordable jewelry.
Geological facts
Also called anyolite, from the Maasai word for green. The name refers to the characteristic combination of green zoisite and red ruby.
Field identification & locations
Identify by the distinctive red-and-green mottling, often with dark inclusions; it is commonly mined in Tanzania. These appear to be drilled, polished beads rather than rough specimens.
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