Interactive IRUG Spectrum

Section: 6

Minerals and pigments (MP)

Page: 415

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Details

IRUG filename: IMP00415	Data type: Infrared	IRUG material class: Minerals and pigments (MP)
Sample type: Reference material	Common name(s): Pyroaurite	Chemical/botanical name(s): Hydrated carbonate with hydroxyl or halogen (class), sjogrenite (mineral group)
Source location 1: Langban, Filipstad, Varmland, Sweden	Sample source 2: British Museum	Source location 2: Great Russell Street, London, WC1B-3DG, UK
Sample identifier 2: BM83815	Sample source 3: The Natural History Museum, National Museums of Scotland	Source location 3: Cromwell Road, London, SW7 5BD, UK, Edinburgh, UK
Color: Buff	Other: Dimorphous with sjogrenite, spectrum is identical to that of sjogrenite (IR2818)	Application: Transmission FTIR spectroscopy
Mode: Tran	Literature Reference: Jones, G. C., and B. Jackson. Infrared Transmission Spectra of Carbonate Minerals. London: Chapman & Hall, 1993., Hansen, H. C. B. "Composition, Stabilization, and Light Absorption of Fe(II)Fe(III) Hydroxy Carbonate (green Rust)." Clay Minerals 24 (1989): 663-69., Hashi, K., S. Kikkawa, and M. Koizumi. "Preparation and Properties of Pyroaurite like Hydroxy Minerals." Clays and Clay Minerals 31 (1983): 152-54.	Originating institution name: Natural History Museum, National Museums of Scotland
Originating institution acronym: NHM	Molecular formula: CH24 Fe2 Mg6 O23	Linear formula: Mg6Fe2(CO3)(OH)16*4H2O
Other analytical methods: EDS (Mg:Fe=approx. 3.1:1 ? with minor Si, Al, Ca and trace Mn), SEM, XRD (6158F NHM std=pyroaurite)