metamorphic

Ruby in fuchsite

Fuchsite (chromium-bearing muscovite) with corundum ruby inclusions; mica schist

AI-generated identification · may be incorrect

Typically green, sparkly to pearly fuchsite matrix with pink-red ruby patches; Mohs hardness about 2–3 for fuchsite and 9 for ruby, with micaceous cleavage and variable vitreous-to-pearly luster. The rounded, polished form obscures the natural texture and cleavage.

Identified September 12, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms in metamorphic rocks where chromium-rich fluids or protoliths produce fuchsite and corundum; many commercial specimens come from India. The host rock is generally Precambrian to Paleozoic, though the exact age depends on locality.

Uses & applications

Primarily sold as a decorative lapidary stone, cabochon, or collector specimen; rarely used as gem-quality ruby because the inclusions are opaque and heavily fractured. Fuchsite is not an important industrial mica source in this form.

Geological facts

The green color comes from chromium in muscovite, while the red areas are ruby, creating a distinctive natural color contrast. Some similar material contains pink corundum or zoisite and may be marketed broadly as ruby fuchsite.

Field identification & locations

Identify it by the opaque green micaceous matrix, glittery cleavage surfaces, and contrasting pink-red corundum patches; a glassy red streak or hardness test can help distinguish ruby. Common sources include India, Russia, and Brazil.