This is a loose, oval-shaped sillimanite cut as a cabochon. The stone features a dark, opaque body color and displays a distinct optical phenomenon known as chatoyancy, or the "cat's eye" effect. A sharp streak of light runs longitudinally across the center of the stone, resembling the slit eye of a cat.

Key Visual Specifications

• Gemstone Type: Cat's Eye (Species unconfirmed, possibly Chrysoberyl, Quartz, or Apatite based on visual appearance)

• Shape: Oval

• Cut: Cabochon

• Color: Black with deep Brownish-Green accent

• Optical Effect: Chatoyancy (Distinct vertical eye)