The mineral eudialyte was first described in 1819 in Greenland by German professor of chemistry Frederich Stromeyer who named it after two Greek words, 'eu' meaning 'well' and 'dialytos' meaning 'decomposable'. This was in reference to the fact that eudialyte decomposes particularly well in acids and in some cases dissolves completely.
The location where stones are found helps with correct identification because eudialyte is a rare and complicated mineral that's known to have as many as forty six different chemical elements. Found in alkaline igneous rocks, eudialyte is mined primarily in Mount Saint Hilaire in Canada and the Kola Peninsula in Russia but it can also be found in Greenland, Norway and Arkansas in the USA.
We recently had our knuckles rapped and were told that for the last twenty or so years we've been pronouncing the name of this mineral incorrectly. Instead of eu~da~lyte as we've been saying, it should apparently be pronounced as eu~dia~lyte (you~dyer~lyte).
In crystal healing eu dia lyte is said to help with self love and aids giving love to others whilst helping one to learn about forgiveness. It facilitates extra sensory perception (ESP) and has been used to help optic nerve disorders. It replenishes energy levels in cases of over exertion, increases vitality, helps to cleanse the body and helps with the regeneration of damaged organs particularly the thyroid.
Eudialyte is graded 5 to 5½ on Mohs scale of mineral hardness.
Wikipedia on eudialyte