1
Ferdowsi university of MashhadDepartment of Geology, Faculty of Sciences, Ferdowsi University of Mashhad
2
Master's student, Ferdowsi University of Mashhad
10.22067/gemiran.2026.48527
Abstract
Gem-quality transparent to semi-transparent crystals of demantoid from Bagh Borj, were examined by different conventional and advanced gemological methods. (XRD, EDXRF, XRF, Raman). This study focuses on garnets sourced from Bagh Borj (Kerman), using standard and advanced gemological methods as well as chemical analyses, XRD, energy dispersive X-ray fluorescence (EDXRF) and Raman spectroscopy. The results of XRF showed that the content of Cr and V in most samples is high, with some samples containing a Cr2O3 content up to 0.032%. This suggests that Cr is the primary chromogenic element of Bagh Borj area demantoid, but the role of vanadium cannot be ignored. Raman spectroscopy revealed absorption peaks near 868 cm-1, 816 cm-1 and 517 cm-1, associated with (Si–O)Str vibrations (Si–O stretching vibration), and absorption peaks are displayed near 358 cm-1, related to the rotation of SiO4–R(SiO4)4-, and the peaks near 517 cm-1 are related to (Si–O)bend vibrations (Si–O bending vibration). Additionally, related absorption peaks near 164 cm-1 are attributed to the translation of SiO4–T(SiO4)4-, and absorption peaks near 226 cm-1 are associated with the translation of X2+–T(X2+) (X2+ represents divalent ions). The high pressure mineral assemblage (amphibolite, garnet-amphibolite, kyanite-garnet-amphibolite, hornblendite and epidote-amphibolite), indicated that the studied garnet from serpentinite was formed through high pressure metamorphism, during the subduction zone serpentinization.
Razmara,M and Aghebati,S . (2026). The Formation, genesis and exploration implication of garnet in Serpentinites of Bagh Borj (Kerman Province, Iran). Gemology and industrial minerals, 1(2), 126-133. doi: 10.22067/gemiran.2026.48527
MLA
Razmara,M , and Aghebati,S . "The Formation, genesis and exploration implication of garnet in Serpentinites of Bagh Borj (Kerman Province, Iran)", Gemology and industrial minerals, 1, 2, 2026, 126-133. doi: 10.22067/gemiran.2026.48527
HARVARD
Razmara M, Aghebati S. (2026). 'The Formation, genesis and exploration implication of garnet in Serpentinites of Bagh Borj (Kerman Province, Iran)', Gemology and industrial minerals, 1(2), pp. 126-133. doi: 10.22067/gemiran.2026.48527
CHICAGO
M Razmara and S Aghebati, "The Formation, genesis and exploration implication of garnet in Serpentinites of Bagh Borj (Kerman Province, Iran)," Gemology and industrial minerals, 1 2 (2026): 126-133, doi: 10.22067/gemiran.2026.48527
VANCOUVER
Razmara M, Aghebati S. The Formation, genesis and exploration implication of garnet in Serpentinites of Bagh Borj (Kerman Province, Iran). Gemology and industrial minerals. 2026;1(2):126-133 (In Persian). doi: 10.22067/gemiran.2026.48527