Eskolaite Mineral Data (original) (raw)

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 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 ScalenohedralH-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),

Click Here for Large Eskolaite Structure Window Crystal Structure:

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Help on Above

| | Newnham R E , de Haan Y M , Zeitschrift fur Kristallographie , 117 (1962) p.235-237, Refinement of the alpha Al2O3, Ti2O3, V2O3 and Cr2O3 structures, Locality: synthetic View Additional jPOWD Structure files for Eskolaite [1] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |

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

RelativeIntensity 0% 50% 100% 150% 200% 250% 300% 350% 400% 440%
R

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:

04.03.01.03 (04)Simple Oxides

(04.03)with a cation charge of 3+ (A+++2 O3)

(04.03.01)Corundum-Hematite group (Rhombohedral: R-3c)

04.03.01.01 Corundum Al2O3 R 3c 3 2/m

04.03.01.02 Hematite Fe2O3 R 3c 3 2/m

04.03.01.03 Eskolaite Cr2O3 R 3c 3 2/m

04.03.01.04 Karelianite V2O3 R 3c 3 2/m

04.03.01.05 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
16 - WWW-MINCRYST

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

Eskolaite

Cr2O3
Dana No: 04.03.01.03 Strunz No: 04.CB.05
Locality:

Notes: