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:: Volume 25, Number 2 (7-2017) ::
2017, 25(2): 381-392 Back to browse issues page
Morphological changes in garnet crystals from staurolite schists of Aliabad-Damagh area, South of Hamedan, Iran
Abstract:   (103 Views)

Crystal form of almandine-rich garnets from staurolite schists of Aliabad-Damagh, changes from pure {110} to pure {211} and intermediate forms between these two end-members. Compositional zoning patterns of all forms are similar, consistent with one-step growth during prograde metamorphism. Mineral chemical data indicate that (Mn + Mg)/Ca in the ~60-micron rim of the almandine-rich garnet crystals were affected during this process. The ratio is about 8 for {110} and less than 2 for {211} forms. Changes in garnet-forming reactions from net-transfer to exchange reactions during prograde metamorphism, and consequently, changes in cation diffusion rates in the final stage of garnet growth affect crystal forms, since 110 and 211 faces have different growth rates.

Keywords: garnet, crystal form, chemical composition, morphology, staurolite schist, Aliabad-Damagh, Hamedan.
Full-Text [PDF 123 kb]   (186 Downloads)    
Type of Study: Research | Subject: Special
Received: 2017/06/13 | Accepted: 2017/06/13 | Published: 2017/06/13
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Morphological changes in garnet crystals from staurolite schists of Aliabad-Damagh area, South of Hamedan, Iran. Iranian Journal of Crystallography and Mineralogy. 2017; 25 (2) :381-392
URL: http://ijcm.ir/article-1-797-en.html
Volume 25, Number 2 (7-2017) Back to browse issues page
مجله بلورشناسی و کانی شناسی ایران Iranian Journal of Crystallography and Mineralogy
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