metamorphic
Ruby in Zoisite (Anyolite) or Tumbled Dyed Agate/Quartzite
Zoisite with Corundum (Al2O3 + Ca2Al3(SiO4)3(OH))
Vibrant magenta-pink to deep purple with black matrix; vitreous to dull luster; Mohs hardness 6 to 9; polished tumbled finish.
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Physical properties
Vibrant magenta-pink to deep purple with black matrix; vitreous to dull luster; Mohs hardness 6 to 9; polished tumbled finish.
Formation & geological history
Formed through regional metamorphism where corundum (ruby) crystals grow alongside zoisite and amphibole/hornblende in metamorphic terrains.
Uses & applications
Popular for lapidary work, jewelry beads, tumbled pocket stones, carvings, and crystal healing collections.
Geological facts
Also known as Anyolite, first discovered near Longido, Tanzania in 1954. The name Anyolite comes from the Maasai word 'anyoli', meaning green, though dyed or purple-dominant varieties are also common in the market.
Field identification & locations
Look for the distinct contrast between the magenta/purple corundum phase and dark amphibole matrix; often tested for dye with alcohol.
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