| 摘要 |
An object of the present invention is to provide a glass-ceramic which is suitable as a material for forming a reflecting mirror substrate. The glass-ceramic has celsian as a primary crystal phase and contains SiO2, Al2O3, BaO, and TiO2 as primary components and Li2O as a modification component, wherein the amount of Li2O falls within a range of 0.05 to 1.0 wt. %. The glass-ceramic is substantially formed of a crystal phase of celsian alone.
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