Crystallized-glass-made artificial nucleus for pearl, production process of the artificial nucleus, and pearl produced using the artificial nucleus
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United States of America Patent
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Jan 2, 1996
Grant Date -
N/A
app pub date -
Jan 5, 1995
filing date -
Jan 5, 1994
priority date (Note) -
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Abstract
An artificial nucleus made of a crystallized glass is provided for use in the production of a pearl. The crystallized glass has been produced using a batch having the following composition: SiO.sub.2 . . . 40-65 wt. % MgO . . . 3-16 wt. % MgF.sub.2 . . . 6.5-17 wt. % K.sub.2 O . . . 7.5-18 wt. % ZrO.sub.2 . . . 0.01-15 wt. % CaO . . . 0.1-20 wt. % P.sub.2 O.sub.5 . . . 0.1-20 wt. % BaO and/or SrO . . . 0.1-13 wt. % and has crystalline phases composed primarily of tetrasilicon fluormica and formed in a glass matrix phase.
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