Omphacite R061129
Name: Omphacite
RRUFF ID: R061129
Ideal Chemistry: (Ca,Na)(Mg,Fe,Al)Si2O6
Locality: near Occidental, Sonoma County, California, USA
Source: Michael Scott S104252 [view label]
Owner: RRUFF
Description: Green granular massive associated with brown grossular and clinochlore
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Group: [ pyroxene (81) ]
Quick search: [ All Omphacite samples (2) ]
CHEMISTRY 
RRUFF ID: R061129.2
Sample Description: Microprobe Fragment
Measured Chemistry: (Ca0.51Na0.48)Σ=0.99(Mg0.44Al0.44Fe2+0.14Fe3+0.02)Σ=1.04Si2.00O6 ; (darker phase) : (Mg2.52Al0.32Fe2+2.13Mn0.03)Σ=5Al0.94(Si3.00Al1.17)O10(OH)8 ( lighter, secondary phase = clinochlore)
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: R061129
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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: R061129.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 9.581(5)Å    b: 8.769(4)Å    c: 5.251(2)Å
alpha: 90°    beta: 106.84(2)°    gamma: 90°   Volume: 422.2(2)Å3    Crystal System: monoclinic
  File Type Information Close
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
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REFERENCES for Omphacite

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]

Hoffmann C A S, Breithaupt A (1815) Omphazit, Handbuch der Mineralogie, 2, 302-302   [view file]

Dana E S (1904) Monoclinic Section. Pyroxene, in The System of Mineralogy of James Dwight Data 1837-1868, Sixth Edition John Wiley & Sons New York 352-371   [view file]

Clark J R, Appleman D E, Papike J J (1969) Crystal-chemical characterization of clinopyroxenes based on eight new structure refinements, Mineralogical Society of America Special Paper, 2, 31-50   [view file]

Curtis L, Gittins J, Kocman V, Rucklidge J C (1975) Two crystal structure refinements of A p2/n titanian ferro-omphacite, The Canadian Mineralogist, 13, 62-67   [view file]

Cameron M, Papike J J (1981) Structural and chemical variations in pyroxenes, American Mineralogist, 66, 1-50   [view file]

Morimoto N (1988) Nomenclature of pyroxenes, Mineralogical Magazine, 52, 535-550   [view file]

Pavese A, Bocchio R, Ivaldi G (2000) In situ high temperature single crystal X-ray diffraction study of a natural omphacite, Mineralogical Magazine, 64, 983-993   [view file]

Buzatu A, Buzgar N (2010) The Raman study of single-chain silicates, Analele Stiintifice Ale Universitatii, Al. I. Cuza Iasi Geologie, 56, 107-125   [view file]

Pandolfo F, Nestola F, Cámara F, Domeneghetti M C (2012) High-pressure behavior of space group P2/n omphacite, American Mineralogist, 97, 407-414   [view file]

Schultze D J, Flemming R L, Shepherd P H M, Helmstaedt H (2014) Mantle-derived guyanaite in a Cr-omphacite xenolith from Moses Rock diatreme, Utah, American Mineralogist, 99, 1277-1283

Nespolo M, Aroyo M I (2016) The modular structure of pyroxenes, European Journal of Mineralogy, 28, 189-203

Hao M, Pierotti C E, Tkachev S, Prakapenka V, Zhang J S (2019) The single-crystal elastic properties of the jadeite-diopside solid solution and their implications for the composition-dependent seismic properties of eclogite, American Mineralogist, 104, 1016-1021