...The molten mass seems to have flowed over in successive waves, and thetop of each wave was covered with a dark vitreous scum carrying scoriæwith angular fragments... 
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...Not only, moreover, does grinding effect anoptical change in vitreous pigments, but it imposes further alteration...
George Field 「Field's Chromatography」
...Upon breaking the stone, the fracture was vitreous, or like that of glass, and it scintillated on steel being applied...
David Collins 「An Account of the English Colony in New South Wales, Vol. 2」
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