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Subsilicic sodium gedrite in leptite of quartz keratophyric origin, Nordmark (Sweden)
Published online by Cambridge University Press: 05 July 2018
Extract
The Mg—Fe orthoamphibole series □ (Mg, Fe)7Si8O22(OH)2 — Na(Mg, Fe)5- Al2Si5Al3O22(OH)2 has an open end in the sense that the Si5 end member has not been found in nature; tiny domains of near end–member composition in intricately zoned crystals (Schumacher, 1980; Robinson et al. 1982), appeared to be intergrowths of two different double-chain silicates (Schumacher, pers. comm., 1994).
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- Copyright © The Mineralogical Society of Great Britain and Ireland 1996
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