metamorphic
Polished ruby-in-fuchsite (probable)
Corundum (Al₂O₃) with green fuchsite mica (Cr-muscovite), possibly zoisite/amphibole
AI-generated identification · may be incorrectPink-red and green mottled, earthy to vitreous luster; likely hardness about 2–9 depending on exposed mineral, with no obvious cleavage. The rounded surface appears tumbled or polished, and the dark metallic-looking line may be matrix mineral or mounting hardware.
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Physical properties
Pink-red and green mottled, earthy to vitreous luster; likely hardness about 2–9 depending on exposed mineral, with no obvious cleavage. The rounded surface appears tumbled or polished, and the dark metallic-looking line may be matrix mineral or mounting hardware.
Formation & geological history
Typically formed by metamorphism and metasomatism in aluminum- and chromium-rich rocks, commonly Proterozoic to younger; classic material comes from India, Tanzania, and Madagascar.
Uses & applications
Used as ornamental lapidary material, cabochons, beads, and inexpensive jewelry; ruby-rich pieces may have collector interest, though most are decorative rather than gem-grade.
Geological facts
Ruby-in-fuchsite is recognized by vivid red corundum patches contrasting with green chromium-bearing mica. The specimen could also be ruby-in-zoisite or another mixed metamorphic rock, which requires testing for reliable identification.
Field identification & locations
Look for mica sparkle, green matrix, and red translucent-to-opaque corundum; a hardness test is diagnostic, since ruby scratches glass while fuchsite does not. Common sources include India, Tanzania, and Madagascar.
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