Hydrothermally grown buddingtonite, an anhydrous ammonium feldspar (NH4AlSi3O8) (original) (raw)

Abstract

Ammonium feldspar was grown hydrothermally from a gel, having a stöchiometric Al2O3·6SiO2 composition. As a source for NH +4 , a 25 percent NH3 solution was used. Internal Cr/CrN and graphite/methane buffers fixed the fugacity of NH3 during the experiments. Unit cell parameters of the synthetic ammonium feldspar are a: 0.8824 (5) nm, b: 1.3077 (8) nm, c: 0.7186 (4) nm, β: 116.068 (12)°, V: 0.7448 (34) nm3. the X-ray power diffraction pattern is measured and indexed in accordance to the space group C2/m. Infrared and thermal gravimetric analyses provide no evidence for the presence of structurally bound water molecules in the crystal structure of synthetic ammonium feldspar. Hydrothermally grown anhydrous ammonium feldspar is shown to be identical to the mineral buddingtonite by the similarity of the data between the synthetic and natural materials. There may be justification for considering natural buddingtonite as an anhydrous feldspar with the ideal formula NH4Si3O8. Reexamination of natural specimens is desirable.

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Author notes

1. R. J. M. Konings
   Present address: Netherlands Energy Research Foundation ECN, P.O. Box 1, 1755 ZG, Petten, The Netherlands

Authors and Affiliations

1. Institute for Earth Sciences, University of Utrecht, Budapestlaan 4, P.O. Box 80.021, 3508 TA, Utrecht, The Netherlands
   J. H. L. Voncken, R. J. M. Konings, J. B. H. Jansen & C. F. Woensdregt

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1. J. H. L. Voncken
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2. R. J. M. Konings
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3. J. B. H. Jansen
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4. C. F. Woensdregt
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Voncken, J.H.L., Konings, R.J.M., Jansen, J.B.H. et al. Hydrothermally grown buddingtonite, an anhydrous ammonium feldspar (NH4AlSi3O8).Phys Chem Minerals 15, 323–328 (1988). https://doi.org/10.1007/BF00311036

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• Received: 14 July 1987
• Issue Date: March 1988
• DOI: https://doi.org/10.1007/BF00311036

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