from The Century Dictionary.
- noun A mineral closely allied to uraninite, but containing some yttrium, erbium, and other rare substances, found in Norway.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A crystalline variety of
Sorry, no etymologies found.
April, 1895, Professor Ramsay, who with Lord Rayleigh had discovered the new element argon, detected the presence of the famous helium line in the spectrum of the gas liberated by heating the rare mineral known as cleveite, found in Norway.
_helium_, which has been recently discovered in a terrestrial substance called cleveite; there are also present the vapours of iron, calcium, cerium, titanium, barium, and magnesium.
In 1895, however, Sir William (then Professor) Ramsay, in examining with a spectroscope the gas obtained from a rare mineral from Norway, called cleveite, discovered the presence of a bright line in its spectrum which seemed to be identical with that of helium.
Above the photosphere comes a stratum of cooler vapours and gases, namely, hydrogen and helium, a very light element recently found on the earth, along with argon, in the rare mineral cleveite.