Thulium
Videos
Thulium is a chemical element; it has symbol Tm and atomic number 69. It is the thirteenth element in the lanthanide series of metals. It is the second-least abundant lanthanide in the Earth's crust,
Thulium sublimed dendritic and 1cm 3 cube
Per Teodor Cleve, the scientist who discovered thulium as well as holmium.
Thulium is found in the mineral monazite
Holmium
Videos
Holmium is a chemical element; it has symbol Ho and atomic number 67. It is a rare-earth element and the eleventh member of the lanthanide series of elements. It is a relatively soft, silvery, fairly
Thulium
…Teodor Cleve separated two previously unknown components, which he called holmia and thulia, from the rare-earth mineral erbia; these were the oxides of holmium and thulium, respectively. His example of thulium oxide contained impurities of ytterbium oxide. A relatively pure sample of thulium oxide was first…
Holmium 2
Ho2O3, left: natural light, right: under a cold-cathode fluorescent lamp
A specimen of gadolinite