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Eskolaite Mineral Data

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General Eskolaite Information

Help on Chemical  Formula: Chemical Formula: Cr2O3
Help on Composition: Composition: Molecular Weight = 151.99 gm
   Chromium  68.42 %  Cr  100.00 % Cr2O3
   Oxygen    31.58 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cr2O3
Help on Environment: Environment: In chromium-rich termolite skarns, metaquartzites, and chlorite veins. Rare component of chondrite meteorites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1958
Help on Locality: Locality: Outokumpu, Karelia, Finland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pentti Eelis Eskola (1883-1964), of the University of Helsinki, Helsinki, Finland.
Help on Name Pronunciation: Name Pronunciation: Eskolaite + Pronunciation Say ESKOLAITE
Help on Synonym: Synonym: ICSD 201102
  PDF 38-1479

Eskolaite Image

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  Eskolaite   Chalcocite

Comments: Green crystalline eskolaite on massive chalcocite.
Location: Lubelin, Poland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Eskolaite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.74304
Help on Cell Dimensions: Cell Dimensions: a = 4.958, c = 13.6, Z = 6; V = 289.52 Den(Calc)= 5.23
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.67(1), 2.67(0.97), 3.63(0.96),

Physical Properties of Eskolaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black, Dark green.
Help on Density: Density: 5.18
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Hexagonal - Six-sided crystal shape in cross-section or habit.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 8-8.5 - Between Topaz and Chrysoberyl
Help on Luster: Luster: Metallic
Help on Streak: Streak: green

Optical Properties of Eskolaite

Help on Dichroism (e): Dichroism (e): emerald green.
Help on Dichroism (w): Dichroism (w): olive green.
Help on Optical Data: Optical Data: Uniaxial (?).
  NCalc= 2.52 - from Gladstone-Dale relationship (KC = 0.29) where Ncalc=Dcalc*KC+1
NCalc= 2.5 - from Gladstone-Dale relationship (KC = 0.29) where Ncalc=Dmeas*KC+1
Help on RL Color: RL Color: Gray with emerald green internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Eskolaite in Air
λ R  ∑ R(λ) 
 400 nm   24.50   
 420 nm   23.60 
 440 nm   22.70 
 460 nm   22.10 
 480 nm   22.00 
 500 nm   21.80 
 520 nm   21.50 
 540 nm   21.00 
 560 nm   20.50 
 580 nm   20.10 
 600 nm   19.80 
 620 nm   19.70 
 640 nm   19.60 
 660 nm   19.50 
 680 nm   19.50 
 700 nm   19.50 
Calculated Relative Intensity Colors of Eskolaite in Air
   0%   50% 100% 150% 200% 250% 300% 350% 400% 440%

Calculated Properties of Eskolaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.96 gm/cc
note: Specific Gravity of Eskolaite =5.23 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEEskolaite = 15.66 barns/electron
U=PEEskolaite x rElectron Density= 77.59 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eskolaite is Not Radioactive

Eskolaite Classification

Help on  Dana Class: Dana Class: (04)Simple Oxides
  (04.03)with a cation charge of 3+ (A+++2 O3)
  (04.03.01)Corundum-Hematite group (Rhombohedral: R-3c) Corundum Al2O3 R 3c 3 2/m Hematite Fe2O3 R 3c 3 2/m Eskolaite Cr2O3 R 3c 3 2/m Karelianite V2O3 R 3c 3 2/m Tistarite! Ti2O3 R 3c 3 2/m
Help on  Strunz Class: Strunz Class: 04.CB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.C - Metal:Oxygen = 2:3, 3:5, and Similar
  04.CB -With medium-sized cations
04.CB.05 Auroantimonate* AuSbO3 Ortho ? Ortho
04.CB.05 Geikielite MgTiO3 R 3 3
04.CB.05 Brizziite-III NaSbO3 R 3 3
04.CB.05 Brizziite-VII NaSbO3 R 3 3
04.CB.05 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3
04.CB.05 Corundum Al2O3 R 3c 3 2/m
04.CB.05 Eskolaite Cr2O3 R 3c 3 2/m
04.CB.05 Hematite Fe2O3 R 3c 3 2/m
04.CB.05 Karelianite V2O3 R 3c 3 2/m
04.CB.05 Ilmenite FeTiO3 R 3 3
04.CB.05 Melanostibite Mn(Sb,Fe)O3 R 3 3
04.CB.05 Pyrophanite MnTiO3 R 3 3
04.CB.05 Romanite* (Fe,U,Pb)2(Ti,Fe)O4 Trig ? Trig
04.CB.05 Tistarite! Ti2O3 R 3c 3 2/m

Other Eskolaite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Eskolaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - University of Colorado - Mineral Structure Data

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Dana No: Strunz No: 04.CB.05





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