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karibib:geology:citrine

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Gemstone Info

Citrine is one of the most affordable gemstones, thanks to the durability and availability of this golden quartz. Named from the French name for lemon,"citron," many citrines have a juicy lemon color.

Citrine includes yellow to gold to orange brown shades of transparent quartz. Sunny and affordable, citrine can brighten almost any jewelry style, blending especially well with the yellow gleam of polished gold.

In ancient times, citrine was carried as a protection against snake venom and evil thoughts.

Although the darker, orange colors of citrine, sometimes called Madeira citrine after the color of the wine, has generally been the most valued color, in modern times, many people prefer the bright lemony shades which mix better with pastel colors. Citrine is generally more inexpensive than amethyst and is also available in a wide range of calibrated sizes and shapes, including very large sizes.

Most citrine is mined in Brazil. Supply of citrine is good from the Brazilian state of Rio Grande do Sul, particularly from the Serra mine, which is producing 300kg a month of hammered goods. The Iraâ mine produces an additional 100kg a month of hammered goods.

Sometimes you will hear citrine referred to as topaz quartz, which is incorrect. This name was used in the past in reference to the color, which is sometimes similar to the color of topaz. Since topaz is a separate mineral, this type of name can be confusing and should not be used. However, citrine is considered an alternative to topaz as the birthstone for November.

Since most citrine on the market started its life as amethyst which was heated to turn its color to gold, citrine jewelry, as well as amethyst jewelry, should be kept away from prolonged exposure to strong light or heat. With this precaution, citrine jewelry will last for many generations.

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CITRINE

 

  • VARIETY OF: Quartz , SiO2 .
  • USES: Gemstone and ornamental stone.
  • BIRTHSTONE FOR: November
  • COLOR: various shades of yellow and orange.
  • INDEX OF REFRACTION: 1.544-1.553
  • BIREFRINGENCE: 0.009
  • HARDNESS: 7
  • CLEAVAGE: none
  • CRYSTAL SYSTEM: trigonal

 

Citrine is any quartz crystal or cluster that is yellow or orange in color. Although often cut as a gemstone, natural citrine is actually somewhat rare. Most citrines on the market have been heat treated. Specimens of low grade, inexpensive amethyst or smoky quartz are often cooked at high temperatures to produce the more profitable orange yellow citrine. Citrines whose colors have been produced by artificial means tend to have much more of an orange or reddish caste than those found in nature, which are usually a pale yellow. Much of the natural citrines may have started out as amethyst but heat from nearby magmatic bodies may have caused the change to citrine. Interestingly, a popular gemstone on the market is a mixture of half amethyst and half citrine and is given the name ametrine.

Citrine is only one of several quartz varieties. Other varieties that form macroscopic crystals are the following:

  • citrine - a yellow to orange gemstone variety that is rare in nature but is most often created by heating natural amethyst.
  • milky quartz - the cloudy white variety.
  • rock crystal - the clear variety that is also used as a gemstone.
  • rose quartz - a pink to reddish pink variety.
  • smokey quartz - the brown to gray variety.

 

 
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