Spring 2013 - Vol. 49, No. 1
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Petrochemical Characteristics and Genesic Significance of Luodian Jade from Guizhou

Luodian jade is a newly discovered nephrite variety in 2009 at the Luodian county of Guizhou province, China.

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Paramagnetic Hole Centres in Natural Zircon and Zircon Colouration

This article explores atomic defect centers (color centers) of natural zircon from three localities (North Carolina, the Massif Central in the south of France, and the Ural Mountains of Russia).

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The “Glet Filling”: The Filling of the Cracks in Precious Stones Under Scrutiny

This short article discusses several important aspects of crack-filling in colored stones and diamonds.

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Copper-Bearing Minerals of Colorado

The state of Colorado has produced some significant copper-bearing mineral specimens.

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A New Defect Center in Type Ib Diamond Inducing One Phonon Infrared Absorption: The Y Center

This paper describes the discovery of a new defect center in natural and synthetic type Ib diamonds, named the Y center.

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Perles de Culture de la Mer de Cortez: Les Belles Inconnues [Unknown Beauties: Cultured Pearls from the Cortez Sea]

The first part of the article gives a historical survey of the Cortez Sea (Gulf of California) pearls, followed by an account of the actual situation.

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Major Crocoite Discoveries at the Adelaide Mine, Tasmania

Crocoite was firstly discovered in Urals in 1766 and named as crocoise in 1832.

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Peridot, Pyroxene, and Plagioclase: Mantle Megacrysts from Lunar Crater Volcanic Field in Nevada

Megacrysts within xenoliths transported by explosive volcanic eruptions to the surface fascinate geologists, mineralogists and gemologists because they are fingerprints of the Earth’s upper mantle and possible collective items of crystal hunters.

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Gemstones and Minerals

Nestled within this huge textbook on analytical archaeometry is a useful chapter for today’s gem professional.

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Azurite Through the Ages: Millennia of Mining Have Not Depleted Its Sources

Azurite, a copper carbonate mineral, is a common secondary mineral.

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