Edgarite Mineral Data

Edgarite Mineral Data

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General Edgarite Information

Chemical Formula:

FeNb3S6

Composition:

Molecular Weight = 526.96 gm

Niobium 52.89 % Nb

Iron 10.60 % Fe

Sulfur 36.51 % S

______

100.00 %

Empirical Formula:

Fe²⁺Nb₃S₆

Environment:

Coexists with Ti-enriched pyrrhotite in a fenitized xenolith in nepheline syenite.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

Kola Peninsula, northwestern Russia. Link to MinDat.org Location Data.

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.

Synonym:

ICSD 53507

IMA1995-017

PDF 22-350

Edgarite Image

Images:

Edgarite

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

Images:

Edgarite

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

Axial Ratios:

a:c = 1:2.11228

Cell Dimensions:

a = 5.771, c = 12.19, Z = 2; V = 351.59 Den(Calc)= 4.98

Crystal System:

Hexagonal - TrapezohedralH-M Symbol (6 2 2) Space Group: P 6₃22

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

[0001] Perfect

Color:

Dark gray, Black.

Diaphaniety:

Opaque

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Metallic

Optical Properties of Edgarite

RL Anisotrophism:

Strong, from almost white to dark brown.

RL Bireflectance:

Distinct.

RL Color:

Similar to molybdenite.

RL Pleochroism:

Distinct, from gray to light gray with a bluish tint.

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**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	330%
R₁
R₂

Calculated Properties of Edgarite

Electron Density:

r_electron=4.63 gm/cc
note: r_Edgarite=4.98 gm/cc.

Fermion Index

Fermion Index = 0.00498
Boson Index = 0.99502

Photoelectric:

PE_Edgarite= 85.71 barns/electron
U=PE_Edgarite x r_electron= 396.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Edgarite is Not Radioactive

Edgarite Classification

Dana Class:

2.11.13.1 (2)Sulfides - Including Selenides and Tellurides

(2.11)where Am Bn Xp, with (m+n):p=2:3

(2.11.13)Dana Group

2.11.13.1 Edgarite ! FeNb3S6 P 6₃22 6 2 2

Strunz Class:

II/D.07-20 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.07 - Paxite series

II/D.07-10 Paxite CuAs2 P 2₁/c 2/m

II/D.07-20 Edgarite FeNb3S6 P 6₃22 6 2 2

Other Edgarite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(AmMin, Vol 85, p. 1843) OPTIC PROP.(AmMin, Vol 85, p. 1843)

See Also:

Links to other databases for Edgarite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Print or Cut-and-Paste your Edgarite Specimen Label here :

Edgarite

FeNb3S6
Dana No: 2.11.13.1 Strunz No: II/D.07-20
Locality:

Notes: