metamorphic
Ruby in Fuchsite
Corundum (Al2O3) in Chrome-Mica (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 9.0 (ruby) and 2.0-3.0 (fuchsite); Color: Green, reddish-pink, grey, white; Luster: Vitreous to pearly; Crystal Structure: Trigonal/Monoclinic; Specific Gravity: 2.8 - 4.0 (varies based on ratio)
- Hardness
- 9
- Color
- Green, reddish-pink, grey, white
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 9.0 (ruby) and 2.0-3.0 (fuchsite); Color: Green, reddish-pink, grey, white; Luster: Vitreous to pearly; Crystal Structure: Trigonal/Monoclinic; Specific Gravity: 2.8 - 4.0 (varies based on ratio)
Formation & geological history
Formed through regional metamorphism. Often found in Precambrian metamorphic terrains where aluminum-rich rocks are subjected to heat and pressure in the presence of chromium, giving the mica its green color and forming ruby crystals.
Uses & applications
Primarily used as an ornamental stone, for lapidary work including cabochons and carvings, and as a popular specimen for collectors and holistic healing practitioners.
Geological facts
Ruby in Fuchsite is frequently confused with Ruby in Zoisite (Anyolite). A key difference is that Fuchsite usually displays a blue-green hue and 'shimmer' due to mica, whereas Zoisite is a more solid lime green and often contains black hornblende inclusions.
Field identification & locations
Identify by looking for pink-red rubies embedded in a green, sparkly mica-rich matrix. Rubies in this association often show a blue-green halo of kyanite. Commonly sourced from southern India, Brazil, and parts of Russia.
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