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Eskolaite

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Formula:
Cr2O3
System:
Trigonal
Colour:
Black
Hardness:
8 - 8½
Member of:
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

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
4.3.1.3

4 : SIMPLE OXIDES
3 : A2X3
7.14.1

7 : Oxides and Hydroxides
14 : Oxides of Cr
mindat.org URL:
http://www.mindat.org/min-1411.html
Please feel free to link to this page.

First Recorded Occurrence of Eskolaite

Year of Discovery:
1958

Physical Properties of Eskolaite

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:
Cr2O3
Essential elements:
All elements listed in formula:
Common Impurities:
V

Relationship of Eskolaite to other Species

Series:
Forms a series with Karelianite (see here)
Member of:
Other Members of Group:
4.CB.05BrizziiteNaSb5+O3
4.CB.05CorundumAl2O3
4.CB.05Ecandrewsite(Zn,Fe2+,Mn2+)TiO3
4.CB.05GeikieliteMgTiO3
4.CB.05HematiteFe2O3
4.CB.05IlmeniteFe2+TiO3
4.CB.05KarelianiteV23+O3
4.CB.05MelanostibiteMn2+(Sb5+,Fe3+)O3
4.CB.05PyrophaniteMn2+TiO3
4.CB.05Akimotoite(Mg,Fe2+)SiO3
4.CB.05AuroantimonateAuSbO3
4.CB.05Romanite(◻,Pb,Ca)UFe22+(Ti,Fe3+)6Ti12O38
4.CB.05UM1998-11-O-AuHSbAu2+Sb3+O2(OH)
4.CB.05TistariteTi23+O3
4.CB.10AvicenniteTl2O3
4.CB.10BixbyiteMn23+O3
4.CB.15Armalcolite(Mg,Fe2+)Ti2O5
4.CB.15PseudobrookiteFe2TiO5
4.CB.20Zincohögbomite-2N2S[(Zn,Al,Fe2+)3(Al,Fe3+,Ti)8O15(OH)]2
4.CB.20Zincohögbomite-2N6S[(Zn,Mg)7(Al,Fe3+,Ti)16O31(OH)]2
4.CB.20Magnesiohögbomite-6N6S[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6
4.CB.20Magnesiohögbomite-2N3S[(Mg,Fe2+,Zn)4(Al,Ti,Fe3+)10O19(OH)]2
4.CB.20Magnesiohögbomite-2N2S[(Mg,Fe2+)3[Al7(Ti,Fe3+)]O15(OH)]2
4.CB.20Ferrohögbomite-6N12S[(Fe2+,Mg,Zn)5(Al,Ti,Fe3+)12O23(OH)]6
4.CB.25PseudorutileFe2Ti3O9
4.CB.25KleberiteFeTi6O11(OH)5
4.CB.30BerdesinskiiteV23+TiO5
4.CB.30OxyvaniteV23+V4+O5
4.CB.35Olkhonskite(Cr,V)2Ti3O9
4.CB.35SchreyeriteV23+Ti3O9
4.CB.40KamiokiteFe2Mo3O8
4.CB.40Nolanite(V3+,Fe3+,Fe2+,Ti)10O14(OH)2
4.CB.40RinmaniteZn2Sb2Mg2Fe4O14(OH)2
4.CB.40IseiteMn2Mo3O8
4.CB.40MajindeiteMg2Mo3O8
4.CB.45ClaudetiteAs2O3
4.CB.45StibioclaudetiteAsSbO3
4.CB.50ArsenoliteAs2O3
4.CB.50SénarmontiteSb2O3
4.CB.55ValentiniteSb2O3
4.CB.60BismiteBi2O3
4.CB.65SphaerobismoiteBi2O3
4.CB.70SilléniteBi12SiO20
4.CB.75KyzylkumiteTi2V3+O5(OH)
4.CB.80TietaiyangiteFe43+Fe2+TiO9
7.14.2BracewelliteCrO(OH)
7.14.3GrimaldiiteCrO(OH)
7.14.4GuyanaiteCrO(OH)
7.14.5YimengiteK(Cr,Ti,Fe,Mg)12O19
7.14.6Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38
7.14.7McconnelliteCuCrO2
7.14.8RedledgeiteBa(Ti64+Cr23+)O16
7.14.9HawthorneiteBa(MgTi3Cr4Fe4)O19
7.14.10ZincochromiteZnCr2O4
7.14.11Wattersite(Hg2+)2Hg2+(CrO4)O2
7.14.12ChromiteFe2+Cr23+O4
7.14.13MagnesiochromiteMg(Cr,Al,Fe)2O4

Other Names for Eskolaite

Name in Other Languages:
German:Eskolait
Simplified Chinese:绿铬矿
埃斯科拉矿
Spanish:Eskolaita

Other Information

Health Risks:
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

Localities for Eskolaite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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)
    • Transantarctic Mts
      • Buckley Island quadrangle
        • Lewis Cliff
Goodrich, C. A., & Harlow, G. E. (2001). Knorringite-uvarovite garnet and Cr-Eskola pyroxene in ureilite LEW 88774. Meteoritics and Planetary Science Supplement, 36, 68.
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 (former 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
  • Far-Eastern Region
    • Magadanskaya Oblast'
      • Magadan
Sharygin, V. V., Kovyazin, S. V. & Podgornykh, N. M. (2006) Mineralogy of Olivine-hosted Inclusions from the Omolon Pallasite (abstract). Lunar and Planetary Science Conference, XXXVII, abstract no.1235. (Mar 2006)
  • 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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