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Sodic-gedrite

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Formula:
NaMg2(Mg3Al2)(Al3Si5O22)(OH)2
Formula is redefined in the 2012 amphibole nomenclature.
Lustre:
Vitreous
Hardness:
5½ - 6
Crystal System:
Orthorhombic
Name:
In order to better distinguish between amphibole end-member member compositions, the CNMNC has decided to assign a root-name to sodic-gedrite, papikeite
Synonym:
A synonym of Papikeite
Indicator mineral for Ultra High temperature (UHT) granulite facies metamorphism in Mg-Al rich rocks (e.g., metapelites).


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References for Sodic-gedriteHide

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Hawthorne F.C. (1983) The crystal chemistry of the amphiboles. The Canadian Mineralogist: 21: 173-480.
Mandarino, J.A. (1998) The Second List of Additions and Corrections to the Glossary of Mineral Species (1995). The Amphibole Group. Mineralogical Record: 29: 169-174.
Hawthorne, F.C., Oberti, R. (2006) On the classification of amphiboles. The Canadian Mineralogist: 44: 1-21.
Kanazawa, T., Tsunogae, T., Sato, K., Santosh, M. (2008) The stability and origin of sodicgedrite in ultrahigh-temperature Mg-Al granulites: a case study from the Gondwana suture in southern India. Contributions to Mineralogy and Petrology: 157: 95-110.
Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031-2048.

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