metamorphic
Ruby zoisite (anyolite) beads
Ruby-bearing zoisite; zoisite Ca₂Al₃(SiO₄)₃(OH), with corundum ruby Al₂O₃
AI-generated identification · may be incorrectTypically green zoisite matrix with pink-to-red ruby and occasional black hornblende; Mohs hardness 6–7 for zoisite and 9 for ruby. Vitreous to pearly luster, granular crystalline texture, no prominent cleavage in polished beads; color and inclusions vary strongly.
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Physical properties
Typically green zoisite matrix with pink-to-red ruby and occasional black hornblende; Mohs hardness 6–7 for zoisite and 9 for ruby. Vitreous to pearly luster, granular crystalline texture, no prominent cleavage in polished beads; color and inclusions vary strongly.
Formation & geological history
Forms during regional metamorphism of aluminum-rich rocks, commonly in altered mafic or ultramafic environments. Classic material formed in East Africa, especially Tanzania, generally in Precambrian metamorphic terranes.
Uses & applications
Used for cabochons, beads, carvings, and ornamental specimens; attractive pieces are collectible but usually less valuable than fine transparent ruby.
Geological facts
The contrasting green, red, and black colors are characteristic of ruby zoisite, often marketed as “anyolite.” Beads may be stabilized, dyed, or assembled from mixed-quality fragments, so appearance alone cannot confirm natural composition.
Field identification & locations
Identify by the mottled green-and-red pattern, opaque ruby grains, black amphibole inclusions, and relatively moderate hardness of the matrix; glass or dyed jasper imitations are common. Estimated value: $15–$80 for a typical strand, up to $150–$300 for unusually vivid, natural material.
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