didymium

American  

[dahy-dim-ee-uhm, dih-] / daɪˈdɪm i əm, dɪ- /

noun

Chemistry.

1. a mixture of neodymium and praseodymium, formerly thought to be an element. Di

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didymium British  

/ daɪˈdɪmɪəm, dɪ- /

noun

1. a mixture of the metallic rare earths neodymium and praseodymium, once thought to be an element

2. a mixture of rare earths and their oxides used in colouring glass

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Etymology

Origin of didymium

< New Latin < Greek dídym ( os ) twin ( didymous ) + -ium; so named by Swedish chemist Carl Mosander (1797–1858), who discovered it in 1843, from its close association with lanthanum

Example Sentences

On treating with oxalic acid, cerium, lanthanum, and didymium are precipitated as oxalates, which on ignition are converted into oxides.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius

It suggests a didymium in its form and habit, but is near a badhamia.

From The North American Slime-Moulds A Descriptive List of All Species of Myxomycetes Hitherto Reported from the Continent of North America, with Notes on Some Extra-Limital Species by MacBride, Thomas H. (Thomas Huston)

A subnitrate of didymium is formed, and remains as an insoluble residue on extracting with hot water.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius

Cerium, didymium, yttrium, &c., oxides may also sometimes be present, in amounts up to 5%.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" by Various

The rare metals cerium, lauthanum, and didymium have been lately investigated by Drs. Hillebrand and Norton, in Bunsen's laboratory.

From The Galaxy, Volume 23, No. 2, February, 1877 by Various