From YPPedia

Chalcocite
Raw goods
Mass: 5.7 kg	Volume: 1 L
Obtained from: Merchant Brigands, Commodities markets
Used by: Furnishers, Iron mongers, Shipyards, Weaveries
End products: Bludgeons, Cloth, Furniture, Swords

Chalcocite is one of eleven minerals. It is an ingredient in furniture, grey cloth, and swords.

German article: Chalcocit

Spawn Locations

Cobalt	Hunter	Ice	Malachite	Midnight	Sage	Viridian
Moab Island*	Ix Chel* Marlowe Island*	Cringe Island*	Murex Island* Striga Cay* Tethys Island*	Cleopatra's Pearls Lynx Island* Wrasse Island	Ambush Island*	Moab Island

*Islands without market bidding.

Use

Chalcocite is needed in the production of:

• Furnisher products:
  • Armor with spear (1)
  • Armor with sword (1)
  • Blue urn (2)
  • Crossed swords (6)
  • Gibbet (3)
  • Pile of bones (3)
  • Skeleton chair (3)
  • Skeleton in Shackles (3)
  • Skeleton table (3)
  • Tombstone (1)
  • Yellow urn (2)
• Iron monger products:
  • Short sword (1)
  • Saber (3)
  • Skull dagger (3)
• Shipyard products:
  • Leather Gloves (3)
• Weavery products:
  • Grey cloth (1)
  • Fine grey cloth (2)

Real World Counterpart

Chalcocite is made from the elements Copper and Sulfur, by the chemical formula Cu₂S. This is based on the data from http://webminerals.com