1/4
of an inch, varies ; some are dull, some highly brilliant. Specimens
from Dauphin, France, and Scopi, Switzerland, are occasionally cut into
beautiful stone-brown gems, but for gem collections only.
Danburite
has been found in the largest known crystals and in considerable
abundance at Russell, N. Y.,but only occasionally are the crystals
clear enough to cut into gems. Its hardness is 7 to 7.25, its color
usually either wine-colored, honey-yellow, or yellowish brown. Some of
the crystals observed are 6 inches
1 Am. J. Sci. III., Vol. 24, p. 439, Dec., 1882. s Am. J. Sci. ΠΙ., Vol. 20, p. 111, Aug., 1880.
