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Morganite



Morganite, also known as "Pink Beryl", Rose Beryl, "Pink Emerald", Cesian Beryl, is a light pink to rose-colored gem quality beryl, turning pinker upon high temperature treatment; orange/yellow varieties can also be found. Color banding is common in morganite.

 

Additional recommended knowledge

Contents

J. P. Morgan

By the turn of the century, J. P. Morgan (the famous financier) had become one of the most important collectors of gems and minerals and had assembled the most important gem collection in the USA as well as of American gemstones (over 1,000 pieces). Tiffany & Co. actually assembled his first collection -- which basically implied that their "chief gemologist" George Frederick Kunz built the collection for J.P. Morgan -- which was exhibited at the World's Fair in Paris in 1889. The exhibit won two golden awards and drew the attention of important scholars, lapidaries, and the general public. [1]

George Frederick Kunz then continued to build a second, even finer, collection, which was exhibited in Paris in 1900. Collections were donated to the American Museum of Natural History in New York, where they were known as the Morgan-Tiffany and the Morgan-Bement collections. [2]

 

The discovery

Morganite was first discovered together with other gemstone minerals, such as Tourmaline and Kunzite, in California in the early twentieth century at Pala. This started a bonanza for these quite popular gemstones which drew the attention of George Frederick Kunz, knowing Pink Beryl was quite a rarity. [3]

It was George Frederick Kunz who, in 1911, suggested to name the pink variety of Beryl Morganite, after his biggest customer - J.P. Morgan. [4]. Ever since, the stone has held a certain popularity with Tiffany's though it still remains a relatively scarce gem.

Chemical and physical properties

The chemical formula of morganite is: Be3Al2(SiO3)6 beryllium-aluminium silicate.

The chemical composition of beryl is beryllium (14%) aluminium (19%) silicate (67%), usually containing alkali ions, other minerals, water, and gases. It crystallizes in hexagonal shapes, known as habit, and is in the dihexagonal-dipyramidal class of the Hexagonal crystal system. Beryls sometimes crystalize in well formed hexagonal prisms with pedion (flat) terminations. It has refractive index values of 1.57 to 1.58 with weak dichroism. Cleavage is absent to poor in one direction. The hardness is 7.5-8 on the Mohs hardness scale, and the specific gravity ranges from 2.66-2.83.[5]

Many sources attribute morganite's color to the element manganese in interstitial sites in the beryl's ring structure[6]. Other references attribute the color to the element cesium[7]

Different types of Beryl

Colorless - goshenite, Green - emerald, Blue & blue/green - aquamarine, Pink - morganite, Yellow - heliodor, Red - bixbite

Morganite may also be known as pink beryl, or in the jewelry trade as pink emerald. Attempts to change the names of beryl gem varieties were a matter of some contention in the gem trade but this ended for Morganite when National Jeweler Magazine declared in its cover story in Vol. 36 No. 12. June 16, 1994, "Morganite: It's Pink Emerald Now". In July 2005, the auction house Sotheby International sold a 947 carat Morganite Islamic Prayer Bead in their London Islamic Art Auction and they did so calling the gem "Pink Emerald". This was the first major auction house to use the jewelry trade term Pink Emerald instead of the mineral name Morganite.

Value as a gemstone

Morganite is much rarer than other common beryls, like aquamarine and heliodor. Its value is influenced by demand, and is generally less well known than aquamarine. Red Beryl, bixbite, also known as Red Emerald, is also very rare and is primarily found in the Wah-Wah Mountains of Utah.

Enhancements

Morganite can be routinely heat treated to remove patches of yellow and is occasionally being treated by irradiation to improve its color.

See also

References

  1. ^ Morgan and his gem collection, In George Frederick Kunz: Gems and Precious Stones of North America, New York, 1890, accessed online February 20, 2007
  2. ^ Morgan and his gem collections, donation to AMNH, In George Frederick Kunz: History of Gems Found in North Carolina, Raleigh, 1907, accessed online February 20, 2007
  3. ^ Morganite discovery in Pala, CA, AGTA website, accessed online February 20, 2007
  4. ^ Morganite, International Colored Gemstone Association, accessed online January 22, 2007
  5. ^ Weinstein, Michael, 1958, The World of Jewel Stones, p. 104 - 107, Sheridan House, New York
  6. ^ [1], article, New Mexico Facetor's Guild, accessed online March 19, 2007
  7. ^ Hurlbut, Cornelius S. Jr, & Kammerling, Robert C., 1991, Gemology, p. 203, John Wiley & Sons, New York
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Morganite". A list of authors is available in Wikipedia.
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