Niocalite R070150

Name: Niocalite
RRUFF ID: R070150
Ideal Chemistry: Ca7Nb(Si2O7)2O3F
Locality: MolyCorp Trench, Oka, Deux-Montagnes County, Quebec, Canada
Source: James Shigley [view label]
Owner: RRUFF
Description: Yellow prismatic crystals on calcite matrix
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Group: [ Wohlerite (11) ]
RRUFF ID: R070150.2
Sample Description: Microprobe Fragment
Measured Chemistry: (Ca6.20Na0.16Mn0.12Mg0.07Fe0.06Ce0.03La0.01Nd0.01Pr0.01)Σ=6.67(Nb0.99Zr0.03Ta0.02Ti0.01)Σ=1.05(Si2O7)1.96[O3F0.37(OH)0.51]Σ=3.88
Microprobe Data File: [ Download Excel File ]
Sample Description: Unoriented sample, 780 Raman signal was completely overwhelmed by fluorescence
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RRUFF ID: R070150
Sample Description: Unoriented sample, 780 Raman signal was completely overwhelmed by fluorescence
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
RRUFF ID: R070150.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 10.845(1)Å    b: 10.4212(8)Å    c: 7.3669(6)Å
alpha: 90°    beta: 110.113(5)°    gamma: 90°   Volume: 782.5(1)Å3    Crystal System: monoclinic
  File Type Information Close
Calculated diffraction file.

  File Type Information Close
Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

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REFERENCES for Niocalite

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]

Nickel E H (1956) Niocalite - a new calcium niobium silicate mineral, American Mineralogist, 41, 785-786   [view file]

Nickel E H, Rowland J F, Mawwell J A (1958) The composition and crystallography of niocalite, The Canadian Mineralogist, 6, 264-272   [view file]

Li T J, Simonov V I, Belov N V (1966) The crystal structure of niokalite, Soviet Physics - Doklady, 11, 197-199

Mellini M (1982) Niocalite revised: twinning and crystal structure, Tschermaks Mineralogische und Petrographische Mitteilungen, 30, 249-266

Biagioni C, Merlino S, Parodi G C, Perchiazzi N (2012) Crystal chemistry of minerals of the wöhlerite group from the Los Archipelago, Guinea, The Canadian Mineralogist, 50, 593-609   [view file]

Dal Bo F, Friis H, Mills S J (2022) Nomenclature of wöhlerite group minerals, Mineralogical Magazine, 86, 661-676