Mineralogy Database

Edgarite Mineral Data

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General Edgarite Information

Help on Chemical  Formula: Chemical Formula: FeNb2S6
Help on Composition: Composition: Molecular Weight = 434.06 gm
   Niobium  42.81 %  Nb
   Iron     12.87 %  Fe
   Sulfur   44.33 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: Fe2+Nb2S6
Help on Environment: Environment: Coexists with Ti-enriched pyrrhotite in a fenitized xenolith in nepheline syenite.
Help on IMA Status: IMA Status: Approved IMA 1995 (Dana # Added)
Help on Locality: Locality: Kola Peninsula, northwestern Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Alan D. Edgar (1935-1998), Professor of Petrology, University of Western Ontario, London, Ontario, Canada, in recognition of his contributions to the study of alkaline r ocks and synthetic equivalents.
Help on Synonym: Synonym: ICSD 53507
  PDF 22-350

Edgarite Image

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Comments: Scanning electron micro-image edgarite (EDG, fibrous appearing) inclusion in pyrrhotite (PY) with marcasite (MRC, slightly lower reflectance) in silicate matrix (SIL, lowest reflectance).
Location: Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Silvery metallic edgarite crystal to about 0.3mm embedded between pegmatite grains.
Location: Khibiny Massif, Kola Peninsula, Murmanskaja Oblast, Northern Region, Russia. Scale: Picture size 2 mm.
© Tom Loomis / Dakota Matrix

Edgarite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.11228
Help on Cell Dimensions: Cell Dimensions: a = 5.771, c = 12.19, Z = 2; V = 351.59 Den(Calc)= 4.10
Help on Crystal System: Crystal System: Hexagonal - Trapezohedral H-M Symbol (6 2 2) Space Group: P 6322
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.096(1)(114), 1.665(0.8)(300), 6.11(0.8)(002),2.606(0.8)(112), 1.126(0.7)(322), 1.027(0.6)(414), 1.524(0.6)(008), 3.04(0.6)(004),

Physical Properties of Edgarite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Dark gray, Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Metallic

Optical Properties of Edgarite

Help on RL Anisotrophism: RL Anisotrophism: Strong, from almost white to dark brown.
Help on RL Bireflectance: RL Bireflectance: Distinct.
Help on RL Color: RL Color: Similar to molybdenite.
Help on RL Pleochroism: RL Pleochroism: Distinct, from gray to light gray with a bluish tint.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Edgarite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   28.10   40.20 
 546 nm   27.40   39.30 
 589 nm   27.00   38.50 
 650 nm   27.00   36.90 
Calculated Relative Intensity Colors of Edgarite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 330%

Calculated Properties of Edgarite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.85 gm/cc
note: Specific Gravity of Edgarite =4.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0060520482
Boson Index = 0.9939479518
Help on Photoelectric: Photoelectric: PEEdgarite = 70.79 barns/electron
U=PEEdgarite x rElectron Density= 272.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Edgarite is Not Radioactive

Edgarite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.11)where Am Bn Xp, with (m+n):p=2:3
  (02.11.13)Dana Group Edgarite! FeNb2S6 P 6322 6 2 2
Help on  Strunz Class: Strunz Class: 02.DB.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.D - Metal Sulfides, M:S = 3:4 and 2:3
  02.DB -M:S = 2:3 and similar
02.DB.25 Edgarite! FeNb2S6 P 6322 6 2 2

Other Edgarite Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(AmMin, Vol 85, p. 1843) OPTIC PROP.(AmMin, Vol 85, p. 1843)
Help on See Also: See Also: Links to other databases for Edgarite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 02.DB.25





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