Аметист — разлика између измена

*{{cite web |url=http://www.blm.gov/ak/jrmic/poster/amethyst.html |title=Amethyst |work=part of a poster by the Juneau – John Rishel Mineral Information Center |publisher=Alaska office of the United States Bureau of Land Management|accessdate =2006-09- 11. 09. 2006.}}

*{{cite book |title=A Dictionary of Chemistry |publisher=Printed for Thomas Tegg, (et al.) |first=Andrew |last=Ure |year=1827 |url=http://books.google.com/books?vid=OCLC22415868&id=9YS0XNQU8x4C&pg=PA141&lpg=PA141&dq=Amethyst&as_brr=1 |accessdate =2006-09- 11. 09. 2006. |page=141 |quote=The amethyst is a gem of a violet colour, and great brilliancy, said to be as hard as the ruby or sapphire, from which it only differs in colour. This is called the oriental amethyst, and is very rare. When it inclines to the purple or rosy colour, it is more esteemed than when it is nearer to the blue. These amethysts have the same figure, hardness, specific gravity, and other qualities, as the best sapphires or rubies, and come from the same places, particularly from Persia, Arabia, Armenia and the West Indies. The occidental amethysts are merely coloured crystal or quartz.}}