metamorphic
Ruby in Fuchsite (often sold as Ruby in Zoisite)
Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 9.0 (Ruby inclusions) vs 2-3 (Fuchsite matrix); Color: Mottled magenta/pink and green/white; Luster: Vitreous to pearly; Crystal structure: Hexagonal/Trigonal (Rubies) and Monoclinic (Fuchsite)
- Hardness
- 9
- Color
- Mottled magenta/pink and green/white
- Luster
- Vitreous to pearly
Identified More metamorphic →
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Physical properties
Hardness: 9.0 (Ruby inclusions) vs 2-3 (Fuchsite matrix); Color: Mottled magenta/pink and green/white; Luster: Vitreous to pearly; Crystal structure: Hexagonal/Trigonal (Rubies) and Monoclinic (Fuchsite)
Formation & geological history
Formed through regional metamorphism of aluminum-rich rocks. Common in Precambrian metamorphic belts where chromium-rich fluids alter existing minerals to create the green fuchsite matrix around corundum crystals.
Uses & applications
Primary use is lapidary work including beads, cabochons, and ornamental carvings. It is popular in the metaphysical community for 'energy work' and as an affordable decorative specimen for collectors.
Geological facts
Many specimens, including those often seen as beads, are dyed to enhance the magenta saturation. Authentic Ruby in Fuchsite will often show a blue-green rim of kyanite around the rubies, whereas the look-alike 'Ruby in Zoisite' usually includes black hornblende needles.
Field identification & locations
Identify by looking for distinct magenta hexagonal crystal shapes within a softer green or white mica matrix. Under a UV light, the ruby inclusions will glow a brilliant fluorescent red. Common locations include India, Brazil, and Madagascar.
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