Thulium
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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
Erbium
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Erbium is a chemical element; it has symbol Er and atomic number 68. A silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements.
Thulium
…method Carl Gustaf Mosander earlier used to discover some other rare earth elements. Cleve started by removing all of the known contaminants of erbia (Er2O3). Upon additional processing, he obtained two new substances; one brown and one green. The brown substance was the oxide of the element holmium and…
Erbium
Erbium(III) chloride in sunlight, showing some pink fluorescence of Er3+ from natural ultraviolet.
Erbium(III) oxide powder
Carl Gustaf Mosander, the scientist who discovered erbium, lanthanum and terbium