Lead is a chemical element with the symbol Pb (from the Latin plumbum) and...

Columbite, also called niobite, niobite-tantalite and columbate [(Fe,Mn)Nb 2O 6], is a black mineral...

Baryte, barite or barytes is a mineral consisting of barium sulfate (BaSO4). Baryte is...

Tungsten, or wolfram, is a chemical element with the symbol W and atomic number...

Tin is a chemical element with the symbol Sn (from Latin: stannum) and atomic...

Tantalum is a chemical element with the symbol Ta and atomic number 73. Previously...