JUNE PEARL 
PEARL is often considered a
gemstone, although it is not a mineral. Rather,
pearl is a composite of the mineral
Aragonite (Calcium Carbonate) and the
organic compound conchiolin (a protein). The
combination is called nacre, or mother-of-pearl. In
some cases, there is an admixture of the mineral
calcite (another mineral composed of Calcium
Carbonate). In pearl oysters and freshwater pearl
mussels, nacre forms the inner lining of the shell.
In most other molluscs the shell has an appearance
more like porcelain, and lacks the luster and
iridescence of mother-of-pearl
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