Cobalt

Colour Group: Brun Base, Pearl, and Rouille
Rarity: Unnatural
Importable?: Yes

Zinc

Colour Group: Brun Base, Cream, and Rouille
Rarity: Unnatural
Importable?: Yes

Laiton

Colour Group: Brun Base and Rouille
Rarity: Unnatural
Importable?: Yes