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Eskolaite

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Formula:
Cr
 
2
O
 
3
System:TrigonalColour:Black
Hardness:8 - 8½
Member of:Hematite Group
Name:After Professor Pentti Eelis Eskola (1883–1964), University of Helsinki, Helsinki, Finland.


Hematite Group.
The chromium analogue of Corundum, Hematite, and Karelianite.

Classification of Eskolaite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/C.04-30
Nickel-Strunz 10th (pending) edition ID:4.CB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
B : With medium-sized cations
Dana 8th edition ID:4.3.1.3

4 : SIMPLE OXIDES
3 : A2X3
Hey's CIM Ref.:7.14.1

7 : Oxides and Hydroxides
14 : Oxides of Cr
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Type Occurrence of Eskolaite

Type Locality:Outokumpu Cu-Co-Zn-Ni-Ag-Au ore field, Eastern Finland Region, Finland
Year of Discovery:1958

Physical Properties of Eskolaite

Lustre:Metallic
Colour:Black
Streak:Green
Hardness (Mohs):8 - 8½

Crystallography of Eskolaite

Crystal System:Trigonal
Cell Parameters:a = 4.95Å, c = 13.58Å
Ratio:a:c = 1 : 2.743
Unit Cell Volume:V 288.16 ų (Calculated from Unit Cell)

Chemical Properties of Eskolaite

Formula:
Cr
 
2
O
 
3
Simplified for copy/paste:Cr2O3
Essential elements:Cr, O
All elements listed in formula:Cr, O
Common Impurities:V

Relationship of Eskolaite to other Species

Series:Forms a series with Karelianite (see here)
Member of:Hematite Group
Other Members of Group:

- +
Corundum
Al
 
2
O
 
3
Hematite
Fe
 
2
O
 
3
Karelianite
V
3+
2
O
 
3
Tistarite
Ti
3+
2
O
 
3
Related Minerals - Nickel-Strunz Grouping):

- +
4.CB.05Brizziite
NaSb
5+
 
O
 
3
4.CB.05Corundum
Al
 
2
O
 
3
4.CB.05Ecandrewsite
(Zn,Fe
2+
 
,Mn
2+
 
)TiO
 
3
4.CB.05Geikielite
MgTiO
 
3
4.CB.05Hematite
Fe
 
2
O
 
3
4.CB.05Ilmenite
Fe
2+
 
TiO
 
3
4.CB.05Karelianite
V
3+
2
O
 
3
4.CB.05Melanostibite
Mn
2+
 
(Sb
5+
 
,Fe
3+
 
)O
 
3
4.CB.05Pyrophanite
Mn
2+
 
TiO
 
3
4.CB.05Akimotoite
(Mg,Fe
2+
 
)SiO
 
3
4.CB.05Auroantimonate
AuSbO
 
3
4.CB.05Romanite
(◻,Pb,Ca)UFe
2+
2
(Ti,Fe
3+
 
)
 
6
Ti
 
12
O
 
38
4.CB.05UM1998-11-O-AuHSb
Au
+
2
Sb
3+
 
O
 
2
(OH)
4.CB.05Tistarite
Ti
3+
2
O
 
3
4.CB.10Avicennite
Tl
 
2
O
 
3
4.CB.10Bixbyite
Mn
3+
2
O
 
3
4.CB.15Armalcolite
(Mg,Fe
2+
 
)Ti
 
2
O
 
5
4.CB.15Pseudobrookite
Fe
 
2
TiO
 
5
4.CB.20Zincohögbomite-2N2S
[(Zn,Al,Fe
2+
 
)
 
3
(Al,Fe
3+
 
,Ti)
 
8
O
 
15
(OH)]
 
2
4.CB.20Zincohögbomite-2N6S
[(Zn,Mg)
 
7
(Al,Fe
3+
 
,Ti)
 
16
O
 
31
(OH)]
 
2
4.CB.20Magnesiohögbomite-6N6S
[(Mg,Fe
2+
 
)
 
3
(Al,Ti,Fe
3+
 
)
 
8
O
 
15
(OH)]
 
6
4.CB.20Magnesiohögbomite-2N3S
[(Mg,Fe
2+
 
,Zn)
 
4
(Al,Ti,Fe
3+
 
)
 
10
O
 
19
(OH)]
 
2
4.CB.20Magnesiohögbomite-2N2S
[(Mg,Fe
2+
 
)
 
3
[Al
 
7
(Ti,Fe
3+
 
)]O
 
15
(OH)]
 
2
4.CB.20Ferrohögbomite-6N12S
[(Fe
2+
 
,Mg,Zn)
 
5
(Al,Ti,Fe
3+
 
)
 
12
O
 
23
(OH)]
 
6
4.CB.25Pseudorutile
Fe
 
2
Ti
 
3
O
 
9
4.CB.25Kleberite
FeTi
 
6
O
 
11
(OH)
 
5
4.CB.30Berdesinskiite
V
3+
2
TiO
 
5
4.CB.30Oxyvanite
V
3+
2
V
4+
 
O
 
5
4.CB.35Olkhonskite
(Cr,V)
 
2
Ti
 
3
O
 
9
4.CB.35Schreyerite
V
3+
2
Ti
 
3
O
 
9
4.CB.40Kamiokite
Fe
 
2
Mo
 
3
O
 
8
4.CB.40Nolanite
(V
3+
 
,Fe
3+
 
,Fe
2+
 
,Ti)
 
10
O
 
14
(OH)
 
2
4.CB.40Rinmanite
Zn
 
2
Sb
 
2
Mg
 
2
Fe
 
4
O
 
14
(OH)
 
2
4.CB.40Iseite
Mn
 
2
Mo
 
3
O
 
8
4.CB.40Majindeite
Mg
 
2
Mo
 
3
O
 
8
4.CB.45Claudetite
As
 
2
O
 
3
4.CB.45Stibioclaudetite
AsSbO
 
3
4.CB.50Arsenolite
As
 
2
O
 
3
4.CB.50Sénarmontite
Sb
 
2
O
 
3
4.CB.55Valentinite
Sb
 
2
O
 
3
4.CB.60Bismite
Bi
 
2
O
 
3
4.CB.65Sphaerobismoite
Bi
 
2
O
 
3
4.CB.70Sillénite
Bi
 
12
SiO
 
20
4.CB.75Kyzylkumite
Ti
 
2
V
3+
 
O
 
5
(OH)
4.CB.80Tietaiyangite
Fe
3+
4
Fe
2+
 
TiO
 
9
Related Minerals - Hey's Index Grouping:

- +
7.14.2Bracewellite
CrO(OH)
7.14.3Grimaldiite
CrO(OH)
7.14.4Guyanaite
CrO(OH)
7.14.5Yimengite
K(Cr,Ti,Fe,Mg)
 
12
O
 
19
7.14.6Mathiasite
K(Ti,Cr,Fe,Mg,Zr)
 
21
O
 
38
7.14.7Mcconnellite
CuCrO
 
2
7.14.8Redledgeite
Ba(Ti
4+
6
Cr
3+
2
)O
 
16
7.14.9Hawthorneite
Ba(MgTi
 
3
Cr
 
4
Fe
 
4
)O
 
19
7.14.10Zincochromite
ZnCr
 
2
O
 
4
7.14.11Wattersite
(Hg
+
2
)
 
2
Hg
2+
 
(CrO
 
4
)O
 
2
7.14.12Chromite
Fe
2+
 
Cr
3+
2
O
 
4
7.14.13Magnesiochromite
Mg(Cr,Al,Fe)
 
2
O
 
4

Other Names for Eskolaite

Other Languages:
German:Eskolait
Russian:Эсколаит
Simplified Chinese:绿铬矿
埃斯科拉矿
Spanish:Eskolaita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Eskolaite

Reference List:

- +
American Mineralogist: 43: 1098-1106.

Zeitschrift für Kristallographie: 117: 233-237.

Internet Links for Eskolaite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Eskolaite details from Handbook of Mineralogy (PDF)
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  • Localities for Eskolaite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Antarctica
     
    • Eastern Antarctica
      • Queen Maud Land (Dronning Maud Land)
    Ikeda, Y. (1992). An overview of the research consortium, "Antarctic carbonaceous chondrites with CI affinities, Yamato-86720, Yamato-82162, and Belgica-7904". Proc. NIPR Symp. Antarct. Meteorites 5: 49-73. (March 1992)
    Australia
     
    • Victoria
      • City of Greater Shepparton
        • Murchison
    Ma, C., Beckett, J.R., Rossman, G.R. (2010): Discovery of a new chromium sulfide mineral, Cr5S6, in Murchison. 73rd Annual Meteoritical Society Meeting, 2010
    Brazil
     
    • Bahia
      • Érico Cardoso (old Água Quente)
        • Paramirim das Crioulas
    Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 33
    Jeannine and Jacques Cassedanne : "Présence d'eskolaite dans les alluvions stannifères de la Chapada Diamantina (Bahia-Brésil), Bull. Mineral., 1980, 103, pp 600-602.
      • Paramirim
    [MinRec 16:111]
    Canada
     
    • Québec
      • Nord-du-Québec
        • Baie-James
          • Otish Mts
    ALEXANDRE, P., PETERSON, R.C., KYSER, K., LAYTON-MATHEWS, D. & JOY, B. (2014) High-Cr minerals from the Matoush uranium deposit in the Otish Basin, Quebec, Canada. Canadian Mineralogist 52, 61-75.
    Finland
     
    • Eastern Finland Region
    Am Min 43 (1958), 1098
    Weiser, T.W., Kojonen, K.K. and Lodziak, J. (2008): New data of eskolaite, Zn-bearing chromite, willyamite and ullmannite from the Outokumpu mine, eastern Finland. Bulletin of the Geological Society of Finland, 80, 5–18. [http://www.geologinenseura.fi/bulletin/Volume80/Weiser.pdf]
    Geological Survey of Finland 2011. Vuonos - Copper Database
    Guyana
     
    • Mazaruni District
      • Kamakusa
    MINERALOGICAL MAGAZINE, DECEMBER 1984, VOL. 48, PP. 560 2
    Ireland
     
    • Co. Wicklow
      • Newton Mt. Kennedy
    Mineralogical Magazine 1977 41 : 402-403
    Japan
     
    • Kyushu Region
      • Nansei Archipelago
        • Okinawa Prefecture
          • Senkaku Islands (Diaoyudao Islands; Diaoyutai Islands)
    Ouroboros - www.um.u-tokyo.ac.jp/museum/ouroboros/01_03/diaoyudaoite.html
    Oman
     
    • Dhofar Province (Al Janubiyah Province)
    Ivanova, M. A., Taylor, L. A., Clayton, R. N., Mayeda, T. K., Nazarov, M. A., Brandstaetter, F., & Kurat, G. (2002, March). Dhofar 225 vs. the CM clan: Metamorphosed or new type of carbonaceous chondrite?. In Lunar and Planetary Institute Science Conference Abstracts (Vol. 33, p. 1437).
    Russia
     
    • Eastern-Siberian Region
      • Prebaikalia (Pribaikal'e)
        • Irkutskaya Oblast'
          • Lake Baikal area
    [MinRec 27:304]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
            • Slyudyanka (Sludyanka)
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
              • Pokhabikha River Valley
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
      • Sakha Republic (Saha Republic; Yakutia)
        • Daldyn-Alakit kimberlite field
          • Daldyn
    Lawrence A. Taylor, Mahesh Anand1, Prinya Promprated1, Christine Floss and Nikolai V. Sobolev, The significance of mineral inclusions in large diamonds from Yakutia, Russia, American Mineralogist; May 2003; v. 88; no. 5-6; p. 912-920
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    www.koeln.netsurf.de/~w.steffens/khib.htm
    • Urals Region
      • Middle Urals
        • Sverdlovskaya Oblast'
          • Ekaterinburg (Sverdlovsk)
            • Malyshevo
              • Izumrudnye Kopi area
    Pautov, L.A., Popov, M.P.,Erokhin, Y.V., Khiller, V.V. and Karpenko,V.Y. (2011): Mariinskite, IMA 2011-057. CNMNC Newsletter No. 11, December 2011, page 2888; Mineralogical Magazine, 75, 2887-2893
    The Moon
     
    • Mare Crisium
    Mokhov, A.V., Kartashov, P.M., Bogatikov, O.A. (2007) Moon under a microscope, - Moscow, Nauka, p. 128 (in Russian).
    USA
     
    • California
      • San Benito Co.
        • Diablo Range
          • New Idria District
            • Picacho Peak
    Dunning, Hadley, Cooper, Magnasco collections
    Mineral and/or Locality  
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