SUBSTANCES USED IN JEWELLERY NOT PROPERLY PRECIOUS STONES.
LTHOUGH
such substances as jet, coral, moon-stone, lapis lazuli, malachite,
etc., do not properly belong to the family of gems; yet, as they are
used for personal adornment, and possess some value, a short
description of them may not be out of place in this treatise.
MOON-STONE.
Formerly
the moon-stone was in fashion in this counÂtry, although it is now
seldom seen. This variety of felspar or orthoclase has a chatoyant reflection,
resemÂbling that of the cat's-eye, and is of a pearly-white colour. A
description called "adularia," from the name of one of the peaks of the
St. Gothard, where
