metamorphic
Ruby in fuchsite (likely polished cabochon)
Corundum (ruby, Al₂O₃) in fuchsite mica (Cr-bearing muscovite)
AI-generated identification · may be incorrectTypically vivid green, sparkly fuchsite containing pink-to-red ruby patches; vitreous to pearly luster and foliated texture. Ruby hardness is 9, while fuchsite is about 2–3; specific gravity is variable, commonly around 2.8–3.3.
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Physical properties
Typically vivid green, sparkly fuchsite containing pink-to-red ruby patches; vitreous to pearly luster and foliated texture. Ruby hardness is 9, while fuchsite is about 2–3; specific gravity is variable, commonly around 2.8–3.3.
Formation & geological history
Forms in metamorphic rocks where aluminum-rich fluids and chromium-bearing minerals produce ruby with chromium-rich mica. Important deposits occur in India, Madagascar, and Tanzania; geological ages vary by locality.
Uses & applications
Used as decorative polished material, cabochons, carvings, and mineral specimens; generally unsuitable for faceted jewelry because fuchsite is soft and fissile.
Geological facts
The green color comes from chromium in fuchsite, which may also produce the red color of ruby. The specimen’s elongated polished form appears shaped rather than naturally crystal-faced.
Field identification & locations
Identify by the contrasting green mica matrix, glittery reflective flakes, and opaque pink-red corundum inclusions; ruby-in-zoisite is a similar but usually more massive, less micaceous material. Avoid scratching or ultrasonic cleaning because fuchsite is delicate.
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