Black Corundum

Black Corundum is a dark, opaque variety of corundum, a crystalline form of aluminum oxide (Al₂O₃). It is known for its toughness and durability, making it valuable for both industrial and ornamental purposes.

Key Features:

1. Color and Appearance:
   • Black corundum appears opaque and black due to inclusions of other minerals such as magnetite, hematite, or graphite.
   • Unlike transparent sapphires or rubies, its beauty is more subdued and metallic.
2. Hardness and Durability:
   • Rated 9 on the Mohs hardness scale, second only to diamond.
   • Highly resistant to wear and scratches.
3. Uses:
   • Industrial Applications: Often crushed into abrasive powders for grinding, polishing, and cutting due to its exceptional hardness.
   • Jewelry: While less common, black corundum can be cut and polished for use in unique, edgy jewelry designs like cabochons or beads.
4. Natural vs. Synthetic:
   • Natural black corundum is rare and primarily occurs in deposits alongside other corundum varieties.
   • Synthetic black corundum may also be produced for industrial uses.
5. Care:
   • Black corundum used in jewelry is low-maintenance due to its toughness.
   • Clean with warm, soapy water and a soft brush, avoiding harsh chemicals.

Would you like information about sourcing, specific jewelry designs, or industrial uses for black corundum?