Sewardite R060720

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Name: Sewardite
RRUFF ID: R060720
Ideal Chemistry: CaFe3+2(AsO4)2(OH)2
Locality: Las Animas mine, La Mur, Sonora, Mexico
Source: Bob Jenkins [view label]
Owner: RRUFF
Description: Aggregates of bright red granular or prismatic crystals, associated with dark red platy arseniosiderite (R150061).
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Group: [ Carminite (8) ]
Quick search: [ All Sewardite samples (2) ]
CHEMISTRY 
RRUFF ID: R060720.2
Sample Description: Microprobe Fragment
Measured Chemistry: Ca1.00(Fe3+1.83Ca0.17)Σ=2(As1.00O4)2((OH)1.83(H2O)0.17)Σ=2
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented sample
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R060720
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
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Raman Data (RAW) View Graph
RRUFF File
POWDER DIFFRACTION 
RRUFF ID: R060720.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 16.435(2)Å    b: 7.432(1)Å    c: 12.125(1)Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 1481.0(6)Å3    Crystal System: orthorhombic
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Calculated diffraction file.

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Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

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DIF File
X-ray Data (XY - RAW) View Graph
RRUFF File
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REFERENCES for Sewardite

American Mineralogist Crystal Structure Database Record: [view record]

Roberts A C, Cooper M A, Hawthorne F C, Criddle A J, Stirling J A R, (2002) Sewardite, CaFe3+2(AsO4)2(OH)2, the Ca-analogue of carminite, from Tsumeb, Namibia: description and crystal structure, The Canadian Mineralogist, 40, 1191-1198   [view file]

Grew E S, Pertsev N N, Roberts A C (2003) New mineral names, American Mineralogist, 88, 1175-1180   [view file]

Mandarino J A (2003) New minerals, The Canadian Mineralogist, 41, 1309-1319   [view file]