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://webmineral.com