metamorphic

Polished ruby-in-fuchsite (probable)

Corundum (Al₂O₃) with green fuchsite mica (Cr-muscovite), possibly zoisite/amphibole

AI-generated identification · may be incorrect

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.

Identified September 9, 2026More metamorphic →

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At a glance

Common name: Polished ruby-in-fuchsite (probable)
Scientific name: Corundum (Al₂O₃) with green fuchsite mica (Cr-muscovite), possibly zoisite/amphibole
Category: metamorphic
Identified: September 9, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a small polished common specimen; $50–$200+ if unusually ruby-rich, attractive, or confirmed gem-quality.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

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.