The term "vitreous" generally describes a material that has a glass-like, glossy appearance. Based on your options:
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Glass - This option aligns well with the meaning of "vitreous," as glass is indeed a vitreous material, exhibiting a smooth and shiny surface.
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Looks like amber not quite glassy - This suggests a more opaque or less glossy appearance, which doesn't fit the definition of "vitreous" as closely.
Therefore, the best option is Glass.