Where is Ruby in Zoisite found?
Ruby (Corundum) and Zoisite
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Open the appRuby in Zoisite occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Ruby in Zoisite
Longido, Tanzania
The primary and most famous source of high-quality Ruby in Zoisite (Anyolite). Found in the Longido mining area, Arusha Region, Tanzania. The deposits are associated with Neoproterozoic metamorphic rocks.
India
Some occurrences of ruby in zoisite have been reported, though generally not as prolific or well-known as the Tanzanian deposits.
Norway
Occurrences of zoisite with corundum have been noted, though not always with the same distinct ruby-in-zoisite aesthetic as Anyolite.
Collecting tips
- Look for Metamorphic Terrains. Focus on areas known for regional metamorphism, especially those with mafic and ultramafic rock formations.
- Identify Associated Minerals. Ruby in Zoisite often occurs with other metamorphic minerals. Familiarize yourself with the appearance of zoisite, amphiboles, and corundum in their natural settings.
- Observe Color and Texture. The distinctive green, black, and red coloration is a key indicator. Look for granular textures with embedded crystals.
- Check for Hardness. Ruby is very hard (9 on Mohs scale), while zoisite is softer (6-6.5). This difference can sometimes be felt or observed on weathered surfaces.
Quick Check
- Color:
- Green, black, and red combination
- Luster:
- Vitreous to pearly (zoisite), adamantine to vitreous (ruby)
- Streak:
- White (for zoisite and ruby)
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