Sentence Examples


  • The dull green was followed successively by amber, white opal, blue opal, straw opal, sea-green, horn colour and various pale tints of soda-lime glass, ranging from yellow to blue.
  • For other forms of silica see OPAL and TRIDYMITE.
  • The finest opal known is obtained in the Upper Cretaceous formation at White Cliffs, near Wilcannia, New South Wales, and at these mines about 700 men find constant employment.
  • Hungary is the only country in Europe where the opal is found, namely at the famous mines of Vorosvagas in the county of Sáros, and at NagyMihaly in that of Zemplin.
  • Experiments were also tried with a violet-coloured glass, a violet opal, a transparent black and with glasses shading from red to blue, red to amber and blue to green.