Defernite R060619



Name: Defernite
RRUFF ID: R060619
Ideal Chemistry: Ca6(CO3)1.58(Si2O7)0.21(OH)7[Cl0.50(OH)0.08(H2O)0.42]
Locality: Kombat mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
Source: Michael Scott S100828 [view label]
Owner: RRUFF
Description: Deep brownish-red color massive embedded in hausmannite, associated with tephroite.
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
CHEMISTRY 
RRUFF ID: R060619.2
Sample Description: Microprobe Fragment
Measured Chemistry: (Ca5.86Mn0.14)Σ=6((CO3)1.62(SiO4)0.38)Σ=2((OH)6.87Cl0.37)Σ=7.24; OH estimated by charge balance; CO3 estimated by difference (2-SiO4)
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: R060619
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
POWDER DIFFRACTION 
RRUFF ID: R060619.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 17.60(2)Å    b: 22.47(3)Å    c: 3.606(3)Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 1426(1)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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REFERENCES for Defernite

American Mineralogist Crystal Structure Database Record: [view record]

Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America. [view file]

Fleischer M, Cabri L J, Chao G Y, Pabst A (1980) New mineral names, American Mineralogist, 65, 1065-1070   [view file]

Sarp H, Taner M F, Deferne J, Bizouard H, Liebich B W (1980) La defernite, Ca6(CO3)2(OH,Cl)8·nH2O, un nouveau carbonate de calcium chloro-hydroxylé, Bulletin de Minéralogie, 103, 185-189   [view file]

Peacor D R, Sarp H, Dunn P J, Innes J, Nelen J A (1988) Defernite from the Kombat mine, Namibia: A second occurrence, structure refinement, and crystal chemistry, American Mineralogist, 73, 888-893   [view file]

Dunn P J (1991) Rare minerals of the Kombat mine, The Mineralogical Record, 22, 421-425

Armbruster T, Yang P, Liebich B W (1996) Mechanism of the SiO4 for CO3 substitution in defernite, Ca6(CO3)1.58(Si2O7)0.21(OH)7[Cl0.50(OH)0.08(H2O)0.42]: a single-crystal X-ray study at 100 K, American Mineralogist, 81, 625-631   [view file]

Roth P (2007) Defernite, in Minerals first discovered in Switzerland and minerals named after Swiss individuals Kristallografik Verlag Achberg Germany 176-177