From the tombs of pharaohs to Roman frescoes, Egyptian blue adorned everything from sacred artifacts to everyday pottery.

None of these tales are true, Wiedenbein says, and in fact, Leland Blue stone is not actually a stone at all — it’s an industrial glass called ... to extract minerals and produce refined ...

rather than the mineral itself. As with other forms of obsidian, rainbow obsidian is both rock and glass. However, this isn’t the same kind of glass that’s used in your nice new French doors.

Conservation scientists and archaeologists with direct knowledge of the use of Egyptian Blue took part in the new study and ...

Without severe weather, minerals can sink the bottom allowing for a blue tint, caused by the way ocean water absorbs light, to flourish. "If you take a glass of water and just put a teaspoon full ...

The glassy state of a versatile family of materials has been prepared for the first time. A deep-blue pigment used to tint paints and textiles, Prussian blue is representative of a family of ...