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lazurite
noun
(mineralogy)
A
mineral
of
metamorphosed
limestones.
Lazurite
forms
the
gemstone
lapis
lazuli,
and
crushed
lazurite
provided
the
ultramarine
color
in
artists'
paint
of
the
Old
Masters.
Sodalite
and
lazurite
form
the
sodalite
group
of
silicate
minerals.
Chemical
composition:
Sodium
aluminum
silicate
with
sulphur,
Na₄₋₅Al₃Si₃O₁₂S.
