Lanthanum

Lanthanum in a glass tube.

Lanthanum is a chemical element. It has the chemical symbol La. It has the atomic number 57. It is part of a group of chemical elements in the periodic table named the Lanthanides. It is a rare earth element. It is silvery white, malleable and ductile. It is soft and can be cut with a knife.

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Lanthanum Media

Excerpt from the chart of nuclides showing stable isotopes (black) from barium (Z = 56) to neodymium (Z = 60)
Carl Gustaf Mosander, the scientist who discovered lanthanum as well as terbium and erbium
Production of Lanthanum from Monazite sand
A Coleman white gas lantern mantle burning at full brightness
LaB₆ hot cathode
Comparison of infrared transmittance of ZBLAN glass and silica