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Characterization of emeralds from a historical deposit: Byrud (Eidsvoll), Norway

Abstract : An emerald deposit at Byrud, in southern Norway, yielded significant quantities of crystals and gem rough in the late 19th and early 20th centuries. Complex multiphase inclusions in the emeralds consist of water, gaseous methane, halite, sylvite, calcite, and a sulfide assemblage (pyrrhotite, galena, and sphalerite). This sulfide assemblage makes it easy to distinguish Byrud emeralds from those from other localities with a binocular microscope. The chemical composition of Byrud emeralds is also characteristic: They are colored mostly by vanadium (up to 1 wt.% V2O3), and contain low sodium and magnesium (0.1 wt.% oxide or less). Moreover, the relative amounts of iron, magnesium, chromium, rubidium, and cesium appear to be diagnostic. Infrared absorption spectra show that they contain little water. Emeralds from the Byrud deposit are still occasionally recovered by hobbyist collectors from the mine dumps.
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https://hal-insu.archives-ouvertes.fr/insu-00322665
Contributor : Isabelle Dubigeon <>
Submitted on : Thursday, September 18, 2008 - 1:18:34 PM
Last modification on : Wednesday, October 14, 2020 - 4:16:45 AM

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  • HAL Id : insu-00322665, version 1

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Benjamin Rondeau, Emmanuel Fritsch, Jean-Jacques Peucat, Fred-Steinar Nordrum, Lee Groat. Characterization of emeralds from a historical deposit: Byrud (Eidsvoll), Norway. Gems & Gemology : the quarterly journal of the Gemological Institute of America, GIA - Gemological Institute of America, 2008, 44 (2), pp.108-122. ⟨insu-00322665⟩

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