Segerstromite R130753

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Record 113 of 123  


Name: Segerstromite
RRUFF ID: R130753
Ideal Chemistry: Ca3(As5+O4)2[As3+(OH)3]2
Locality: Cobriza mine, Sacramento District, Copiapó Province, Chile
Source: Bob Jenkins
Owner: RRUFF
Description: Colorless tetrahedral crystals, associated with talmessite, vladimirite, and apatite. Type sample
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Group: [ Not in a structural group (123) ]
CHEMISTRY 
RRUFF ID: R130753.2
Sample Description: Microprobe Fragment
Measured Chemistry: Ca2.98(AsO4)2.00[As(OH)3]2.00 ; The darker phase is fluorapatite.
Microprobe Data File: [ Download Excel File ]
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented sample
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R130753
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 16% of 150mW
POWDER DIFFRACTION 
RRUFF ID: R130753.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 10.7627(2)Å    b: 10.7627(2)Å    c: 10.7627(2)Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 1246.71(4)Å3    Crystal System: cubic
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REFERENCES for Segerstromite

Williams P A, Hatert F, Pasero M, Mills S J (2014) IMA Commission on new minerals, nomenclature and classification (CNMNC) Newsletter 20. New minerals and nomenclature modifications approved in 2014, Mineralogical Magazine, 78, 549-558   [view file]

Yang H, Downs R T, Jenkins R A, Evans S H (2018) Segerstromite, Ca3(As5+O4)2[As3+(OH)3]2, the first mineral containing As3+(OH)3, the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile, American Mineralogist, 103, 1497–1501   [view file]