already remarked, this is one of the various names of the dicroite ;
but it is well to know that the peculiar kind found in Sweden, and
therefore called hydro-jolite of Sweden, is very soft, of a
dark olive-green colour, and is always in red granite. This stone is
not used as a jewel, and it is only valued in mineralogical collections.
At first it was thought that this substance was an opaline felspar, but in time it was acknowledged to be a separate species.
was discovered by some Moravian missionaries in the island of St. Paul,
on the coast of Labrador, and was brought to Europe in 1775, under the
name of the country where it was found.