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Bi-coloured Amethyst Citrine
Cornelian is Related to Amethyst and Citrine
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Cornelian
Cornelian is a red variety of chalcedony which is cryptocrystalline quartz. Its red colour is due to the presence of iron impurities in the form of iron oxide or hematite. It can vary from a flesh red to a clear red. It is usually cut en cabochon, or into beads, and is also used for intaglios and cameos. Imitations of cornelian are made by the staining of agate.

Sources
Originally found in the deserts of Arabia and Egypt, it has also been found in the Rio Grande area, India, China, Colombia, Saxony, Scotland, West Germany and USA.

Technical Details
Chemical Composition and NameSiO2 - Silicon Dioxide
Hardness7
Specific Gravity2.65 - 2.66
Refractive Index (R.I.)1.543 - 1.552 to 1.545 - 1.554
Bi-refringence0.009
Optic SignPositive
Optical CharacterUniaxial


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