||CITRINE, the yellow and orange variety of quartz
VARIETY OF: Quartz, SiO 2
USES: Gemstone and ornamental stone
BIRTHSTONE FOR: November
COLOR: various shades of yellow and orange
INDEX OF REFRACTION: 1.544-1.553
CRYSTAL SYSTEM: trigonal
For natural citrine mineral specimens see our For Sale or Sold lists
Citrine is any quartz crystal or cluster that is yellow or orange in color.
Although often cut as a gemstone, citrine is actually somewhat rare in nature.
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 citrine may have started out as amethyst but heat from nearby magmatic bodies may have caused the change to citrine.
The citrine geodes available in the trade
are always (so far as I am aware) the result of heat treatment of amethyst
Citrine made by heating amethyst may be returned to a purple color by
bombarding it with beta radiation. Interestingly, a popular gemstone on the market is a mixture of half amethyst and half citrine and is given the name ametrine,
made by heating an amethyst until it turns into citrine, then
irradiating a part of the resulting crystal or gemstone to convert that
portion back to amethyst.
Unfortunately for citrine it is often confused with the more expensive orange-yellow topaz and is at times sold as topaz by unscrupulous dealers.
This practice has soured many potential citrine fanciers who see citrine as a fake topaz and not as a legitimate gemstone.
Citrine is only one of several quartz varieties.
Other varieties that form macroscopic (large enough to see) crystals are as follows: