https://www.youtube.com/watch?v=sSqfSmZ0Nvg
Agate is a microcrystalline variety of quartz (silica), chiefly chalcedony, characterized by its fineness of grain and brightness of color. Although...
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https://www.youtube.com/watch?v=sSqfSmZ0Nvg
Agate is a microcrystalline variety of quartz (silica), chiefly chalcedony, characterized by its fineness of grain and brightness of color. Although...