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ESSONITE.
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This substance is by many persons called tellite, definite, arendalite, and many other names.
The
epidote is found chiefly in Norway, but some is procured from France,
Scotland, and Bavaria, where it is found in primitive strata.
Under the blow-pipe, this substance is changed into a brown scoria. Its specific gravity varies from 3·39 to 3-45.
It has double cleavage ; its hardness is less than that of quartz, and
greater than that of felspar ; it receives a fine polish. It is
semi-translucent, and the pearly light which it emits prevents its
being confounded with various kinds of idocrasio. According to three
different chemists, it gives on analysis
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XXXVIII.
ESSON1TE.
This gem
was at first considered a jacinth, under which name it is still denoted
in commerce, and in France it is known as jacinth of Ceylon.
In mineralogical works, however, it is called ein-
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