metamorphic
Ruby in Fuchsite
Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 2-3 (Fuchsite matrix), 9 (Ruby inclusions); Color: Green with red/magenta spots; Luster: Pearly to vitreous; Crystal structure: Monoclinic (matrix)/Hexagonal (ruby spots)
- Hardness
- 2-3 (Fuchsite matrix), 9 (Ruby inclusions)
- Color
- Green with red/magenta spots
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 (Fuchsite matrix), 9 (Ruby inclusions); Color: Green with red/magenta spots; Luster: Pearly to vitreous; Crystal structure: Monoclinic (matrix)/Hexagonal (ruby spots)
Formation & geological history
Forms through regional metamorphism of clay-rich sediments where chromium is present. Rubies crystallize within the green mica (fuchsite) matrix under high pressure and temperature conditions.
Uses & applications
Primarily used for lapidary work, ornamental carvings, decorative 'tower' points, and metaphysical collecting.
Geological facts
It is often confused with Ruby in Zoisite; however, Ruby in Fuchsite is much softer and typically has a blue-white ring of kyanite around the ruby crystals.
Field identification & locations
Found commonly in India, Brazil, and Zimbabwe. Identified by the distinct dark red hexagonal ruby spots against a shimmering, flakey green mica background.
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