Neptunite R060628

Name: Neptunite
RRUFF ID: R060628
Ideal Chemistry: KNa2LiFe2+2Ti2Si8O24
Locality: California, USA
Source: Gemological Institute of America 02 [view label]
Owner: RRUFF
Description: Black gemstone fragment
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Group: [ Neptunite (4) ]
Quick search: [ All Neptunite samples (2) ]
RRUFF ID: R060628.2
Sample Description: Microprobe Fragment
Measured Chemistry: (K0.88Na0.12)Σ=1Na2.00Li1.00(Fe2+1.42Mg0.39Mn0.19)Σ=2Ti2.00Si8.00O24 ; Li not measured but estimated by difference and stoichiometry
Microprobe Data File: [ Download Excel File ]
Sample Description: Unoriented sample

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RRUFF ID: R060628
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
RRUFF ID: R060628.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 16.441(2)Å    b: 12.488(1)Å    c: 9.983(1)Å
alpha: 90°    beta: 115.577(6)°    gamma: 90°   Volume: 1848.8(6)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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REFERENCES for Neptunite

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]

Flink G (1893) Om några mineral från Grönland, Geologiska Föreningens i Stockholm Förhandlingar, 15, 195-208   [view file]

Gossner B, Mussgnug F (1928) Über die systematische Stellung von Neptunit und Babingtonit, Centralblatt für Mineralogie, Geologie und Paläontologie, 1928, 274-281

Heinrich E W, Quon S H (1963) Neptunite from Seal Lake, Labrador, The Canadian Mineralogist, 7, 650-654   [view file]

Borisov S V, Klevtsova R F, Bakakin V V, Belov N V (1966) The crystal structure of neptunite, Soviet Physics - Crystallography, 10, 684-689   [view file]

Cannillo E, Mazzi F, Rossi G (1966) The crystal structure of neptunite, Acta Crystallographica, 21, 200-208

Laird J, Albee A L (1972) Chemical composition and physical, optical, and structural properties of benitoite, neptunite and joaquinite, American Mineralogist, 57, 85-102   [view file]

Kunz M, Armbruster T, Lager G A, Schultz A J, Goyette R J, Lottermoser W, Amthauer G (1991) Fe, Ti ordering and octahedral distortions in acentric neptunite: Temperature dependent X-ray and neutron structure refinements and Mössbauer spectroscopy, Physics and Chemistry of Minerals, 18, 199-213

Jambor J L, Grew E S (1993) New mineral names, American Mineralogist, 78, 233-238   [view file]

Karimova O, Yakubovich O, Zadov A, Gazeev V, Pertsev N, Ivanova A (2010) The crystal structure of magnesioneptunite in the context of neptunite crystal chemistry, Acta Crystallographica, A66, s185-s185