From YPPedia

Cubanite
Raw goods
Mass: 4.7 kg	Volume: 1 L
Obtained from: Merchant Brigands, Commodities markets
Used by: Furnishers, Iron mongers, Apothecaries
End products: Furniture, Swords, Whisking potions

Cubanite is one of eleven minerals. It is an ingredient in falchions, furniture, and whisking potions.

German article: Cubanit

Spawn Locations

Cobalt	Hunter	Ice	Malachite	Midnight	Sage	Viridian
Adder Ridge* Sakejima Island Stormy Fell*	Armstrong Island* Quetzal Island	Kings Island*	Barracuda Island Eitr Glacier* Flyaway Island Tasman Reef* Wyvern Island*	Boyle Island* Meke Island Papaya Island	Fluke Island*	Adder Ridge* Sakejima Island Stormy Fell*

*Islands without market bidding.

Use

Cubanite is needed in the production of:

• Apothecary products:
  • Whisking potion (1)
• Furnisher products:
  • Blotter (1)
  • Fancy wall lamp (2)
  • Gold candles (5)
  • Ship plans (2)
  • Tap (2)
  • Treasure Drop table (12)
• Iron monger products:
  • Falchion (3)

Real World Counterpart

Cubanite is made from the elements Iron, Copper, and Sulfur, by the chemical formula CuFe₂S₃. This is based on the data from http://webminerals.com