lapis-lazuli
1. A deep blue, semi-precious stone, which, when
ground into a powder, was used as ultramarine, a
pigment now produced synthetically. It is a
metamorphic rock, and its color stems from the
blue feldspathoid lazurite, which is normally
(NaAlSiO NaS); however, the properties may vary
significantly in both the natural and synthetic
products. It is used from time to time in the
ornamentation of bookbindings and the coloring of
paper. 2. A clear blue marble veined with gold.
The blue is in the form of large irregular spots,
of a cloudlike appearance, becoming an
increasingly darker shades of blue as the color is
applied several times. The gold veins are produced
by gilding. (152 ,
235 )
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