• journal_title：European Journal of Mineralogy
• Contributor：Fabrizio Nestola ; Marcello Merli ; Paolo Nimis ; Matteo Parisatto ; Maya Kopylova ; Andrea De Stefano ; Micaela Longo ; Luca Ziberna ; Murli Manghnani
• Publisher：E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
• Date：2012-
• Format：text/html
• Language：en
• Identifier：10.1127/0935-1221/2012/0024-2212
• journal_abbrev：Eur J Mineral
• issn：0935-1221
• volume：24
• issue：4
• firstpage：599
• section：Articles

A single crystal of garnet enclosed in a diamond from the Jericho kimberlite (Slave Craton, Canada) has been investigated using X-ray diffraction and X-ray micro-tomography. The novel experimental approach allowed us to determine the crystal structure of the garnet. The unit-cell edge a and fractional atomic coordinates of oxygen were used to determine the composition via an updated Margules model for garnets. The composition is Pyr_0.41(5)Alm_0.36(7)Gro_0.22(1)Uva_0.01(1), which is indistinguishable from the eclogitic garnets found in other Jericho diamonds. We also demonstrated that residual pressures on the inclusion of up to 1 GPa do not affect significantly the determination of the garnet composition by structure refinement.