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Geikielite

Big Photo

San Vito quarry, San Vito, Ercolano, Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy
© D. Preite

Show Geikielite Photos (9)
Formula:
MgTiO
 
3
System:TrigonalColour:black, red, brownish ...
Hardness:5 - 6
Name:For Sir Archibald Geikie (1835-1924), Professor of Geology and Mineralogy in the University of Edinburgh, Scotland, and Director-General of the Geological Survey of Great Britain and Ireland


Ilmenite Group. Geikielite-Ilmenite Series. The magnesium analogue of Ilmenite, Pyrophanite, and Ecandrewsite. The titanium analogue of Akimotoite.

Classification of Geikielite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/C.05-10
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:4.3.5.2

4 : SIMPLE OXIDES
3 : A2X3
Hey's CIM Ref.:7.9.5

7 : Oxides and Hydroxides
9 : Oxides of Ti
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Type Occurrence of Geikielite

Co-type Localities:Rakwana, Sabaragamuwa Province, Sri Lanka
Balangoda, Ratnapura, Sabaragamuwa Province, Sri Lanka
Place of Conservation of Type Material:Naturalk History Museum, London 69078-69079
Year of Discovery:1892

Occurrences of Geikielite

Geological Setting:Contact metamorphism of impure magnesian limestones.

Physical Properties of Geikielite

Lustre:Sub-Metallic
Diaphaneity (Transparency):Translucent, Opaque
Colour:black, red, brownish black
Streak:purple brown
Hardness (Mohs):5 - 6
Cleavage:Distinct/Good
On {1011}
Fracture:Conchoidal, Sub-Conchoidal
Density (measured):3.79 - 4.2 g/cm3
Density (calculated):3.895 g/cm3

Crystallography of Geikielite

Crystal System:Trigonal
Class (H-M):3 - Pyramidal
Space Group:R3
Cell Parameters:a = 5.05478(26) Å, c = 13.8992(7) Å
Ratio:a:c = 1 : 2.75
Unit Cell Volume:V 307.56 ų (Calculated from Unit Cell)
Z:6
Morphology:Tabular to prismatic crystals.

Optical Data of Geikielite

Type:Uniaxial (-)
RI values: nω = 2.310 - 2.350 nε = 1.950 - 1.980
Maximum Birefringence:δ = 0.360 - 0.370

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Anisotropism:Strong
Colour in reflected light:Gray
Internal Reflections:Red
Pleochroism:Weak
Comments:O = Pinkish red
E = Brownish to purplish red

Chemical Properties of Geikielite

Formula:
MgTiO
 
3
Essential elements:Mg, O, Ti
All elements listed in formula:Mg, O, Ti
Common Impurities:Fe,Cr,Mn,Ca

Relationship of Geikielite to other Species

Series:Forms a series with Ilmenite (see here)
Related to:
  • Ilmenite Group
    • 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.05Eskolaite
    Cr
     
    2
    		O
     
    3
    4.CB.05Hematite
    Fe
     
    2
    		O
     
    3
    4.CB.05Ilmenite
    Fe
    2+
     
    		TiO
     
    3
    4.CB.05Karelianite
    V
     
    2
    		O
     
    3
    4.CB.05Melanostibite
    Mn
    2+
     
    		(Sb
    5+
     
    		,Fe
    3+
     
    		)O
     
    3
    4.CB.05Pyrophanite
    Mn
    2+
     
    		TiO
     
    3
    4.CB.05Auroantimonate
    AuSbO
     
    3
    4.CB.05Romanite
    ([],Pb,Ca)UFe
    2+
    2
    		(Ti,Fe
    3+
     
    		)
     
    6
    		Ti
     
    12
    		O
     
    38
    4.CB.10Avicennite
    Tl
     
    2
    		O
     
    3
    4.CB.10Bixbyite
    (Mn
    3+
     
    		,Fe
    3+
     
    		)
     
    2
    		O
     
    3
    4.CB.15Armalcolite
    (Mg,Fe
    2+
     
    		)Ti
     
    2
    		O
     
    5
    4.CB.15Pseudobrookite
    Fe
     
    2
    		TiO
     
    5
    4.CB.15Mongshanite
    (Mg,Cr,Fe
    2+
     
    		)
     
    2
    		(Ti,Zr)
     
    5
    		O
     
    12
    4.CB.20Zincohögbomite-2N2S
    Ti(Zn,Mg,Fe)
     
    2
    		Al
     
    8
    		O
     
    15
    		(OH)
    4.CB.20Zincohögbomite-2N6S
    Ti(Zn,Mg,Fe)
     
    6
    		Al
     
    16
    		O
     
    31
    		(OH)
    4.CB.20Magnesiohögbomite-6N6S
    Ti(Mg,Fe)
     
    2
    		Al
     
    8
    		O
     
    15
    		(OH)
    4.CB.20Magnesiohögbomite-2N3S
    Ti(Mg,Fe)
     
    3
    		Al
     
    10
    		O
     
    19
    		(OH)
    4.CB.20Magnesiohögbomite-2N2S
    Ti(Mg,Fe)
     
    2
    		Al
     
    8
    		O
     
    15
    		(OH)
    4.CB.20Ferrohögbomite-6N12S
    Ti(Fe,Mg)
     
    4
    		Al
     
    12
    		O
     
    23
    		(OH)
    4.CB.25Pseudorutile
    Fe
     
    2
    		Ti
     
    3
    		O
     
    9
    4.CB.25Tietaiyangite
    Fe
    3+
    4
    		Fe
    2+
     
    		TiO
     
    9
    4.CB.30Berdesinskiite
    V
    3+
    2
    		TiO
     
    5
    4.CB.35Kyzylkumite
    V
     
    2
    		Ti
     
    3
    		O
     
    9
    4.CB.35Olkhonskite
    (Cr,V)
     
    2
    		Ti
     
    3
    		O
     
    9
    4.CB.35Schreyerite
    V
     
    2
    		Ti
     
    3
    		O
     
    9
    4.CB.40Kamiokite
    Fe
     
    2
    		Mo
     
    3
    		O
     
    8
    4.CB.40Nolanite
    (V,Fe,Fe,Ti)
     
    10
    		O
     
    14
    		(OH)
     
    2
    4.CB.40Rinmanite
    Zn
     
    2
    		Sb
     
    2
    		Mg
     
    2
    		Fe
     
    4
    		O
     
    14
    		(OH)
     
    2
    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
    Related Minerals - Hey's Index Grouping:
    7.9.1Hongquiite
    TiO
    7.9.2Rutile
    TiO
     
    2
    7.9.3Anatase
    TiO
     
    2
    7.9.4Brookite
    TiO
     
    2
    7.9.6Perovskite
    CaTiO
     
    3
    7.9.7Kassite
    CaTi
     
    2
    		O
     
    4
    		(OH)
     
    2
    7.9.8Tausonite
    SrTiO
     
    3
    7.9.9Crichtonite
    (Sr,La,Ce,Y)(Ti,Fe
    3+
     
    		,Mn)
     
    21
    		O
     
    38
    7.9.10Lucasite-(Ce)
    CeTi
     
    2
    		(O,OH)
     
    6
    7.9.11Hibonite
    (Ca,Ce)(Al,Fe,Ti,Si,Mg)
     
    12
    		O
     
    19
    7.9.12Yttrocrasite-(Y)
    (Y,Th,Ca,U)(Ti,Fe)
     
    2
    		(O,OH)
     
    6
    7.9.13Pyrophanite
    Mn
    2+
     
    		TiO
     
    3
    7.9.14Iwakiite
    Mn(Fe,Mn)
     
    2
    		O
     
    4
    7.9.15Ilmenite
    Fe
    2+
     
    		TiO
     
    3
    7.9.16Pseudobrookite
    Fe
     
    2
    		TiO
     
    5
    7.9.17Ulvöspinel
    Fe
     
    2
    		TiO
     
    4
    7.9.18Pseudorutile
    Fe
     
    2
    		Ti
     
    3
    		O
     
    9
    7.9.19Freudenbergite
    Na
     
    2
    		(Ti,Fe)
     
    8
    		O
     
    16
    7.9.20 Kennedyite
    MgFeTi
     
    3
    		O
     
    10
    7.9.21Armalcolite
    (Mg,Fe
    2+
     
    		)Ti
     
    2
    		O
     
    5
    7.9.22Högbomite
    (Mg,Fe)
     
    2
    		(Al,Ti)
     
    5
    		O
     
    10
    7.9.23Qandilite
    (Mg,Fe)
     
    2
    		(Ti,Fe,Al)O
     
    4
    7.9.24Cafetite
    (Ca,Mg)(Fe,Al)
     
    2
    		Ti
     
    4
    		O
     
    12
    		·4H
     
    2
    		O
    7.9.25Loveringite
    (Ca,Ce)(Ti,Fe,Cr,Mg)
     
    21
    		O
     
    38
    7.9.26Lindsleyite
    (Ba,Sr)(Ti,Zr,Fe,Cr)
     
    21
    		O
     
    38
    7.9.27Priderite
    (K,Ba)(Ti,Fe)
     
    8
    		O
     
    16
    7.9.28Jeppeite
    (K,Ba)
     
    2
    		(Ti,Fe)
     
    6
    		O
     
    13
    7.9.29Ankangite
    Ba(Ti,V
    3+
     
    		,Cr)
     
    8
    		O
     
    16
    7.9.30Ecandrewsite
    (Zn,Fe
    2+
     
    		,Mn
    2+
     
    		)TiO
     
    3
    7.9.31Landauite
    NaMnZn
     
    2
    		(Ti,Fe)
     
    6
    		Ti
     
    12
    		O
     
    38

    Other Names for Geikielite

    Synonyms:
    Geikilithe
    German names:
    Geikielith
    Russian names:
    Гейкилит
    Spanish names:
    Geikielita

    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 Geikielite

    Reference List:Fletcher (1892), Nature: 46: 620.

    Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 535-541.

    Acta Crystallographica: B45: 542-549.

    Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (1995) Handbook of Mineralogy, Volume II. Silica, Silicates. Mineral Data Publishing, Tucson, AZ, 904pp., 2 volumes: 220.

    Internet Links for Geikielite

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    • External Links:
  • Look for Geikielite on Webmineral
  • Look for Geikielite on Athena Mineralogy
  • Look for Geikielite on Wikipedia
  • Look for Geikielite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Geikielite in the Natural History Museum (London) online catalogue
  • Geikielite details from Handbook of Mineralogy (PDF)
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    Localities for Geikielite

    Hide Locality List
    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.
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    (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)
        • Sør Rondane Mts
    Austria
     
    • Styria
      • Weiz
        • Stubenberg am See
    		Tropper, P. et al. (2001, 2007); http://geocities.com/franz_bernhard/polishedslabs.html
    Brazil
     
    • Southeast Region
      • São Paulo
        • Cajati
    		MinRec 15:261-270
    Canada
     
    • Québec
      • Stanstead Co.
        • Wakefield
    		Geological Survey of Canada Miscellaneous Report 41
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • Vysočina Region
        • Nové Město na Moravě
    		Novák, M., Šrein, V.: Ryzí antimon v rutilu z dolomitického mramoru od Studnice u Nového Města na Moravě. Minerál, 1997, roč. 5, č. 4, s. 265-266.
    Finland
     
    • Oulun (Oulu) Lääni
      • Kuhmo
        • Näätäniemi
    		http://rruff.geo.arizona.edu/doclib/hom/geikielite.pdf.
    France
     
    • Languedoc-Roussillon
      • Pyrénées-Orientales
        • Céret
          • Prats de Mollo-La Preste (Prats de Molló-La Presta)
    		Dubru. M, (1986) Pétrologie et géochimie du marbre à brucite et des borates associés au gisement de tungstène de Costabonne, (Pyrénées orientales, France) 930p
    Greenland
     
    • Kitaa (West Greenland) Province
      • Nuuk (Godthåb)
        • Fiskenaes (Fiskenaesset; Qeqertarsuatsiaat)
    		B.F. Windley et al. , Eur. J. Mineral. , 1989, 1, pp. 427-437.
    Italy
     
    • Campania
      • Naples Province
    		Pascal, M.-L., Di Muro, A., Boudouma, O., Fointeilles, M., Principe, C. (2008): Zirconlite, calzirtite, baddeleyite, betafite, geikielite and qandilite in skarn ejecta from Vesuvius - inferences for the magma-wallrock interactions. EGU General Assembly 2008. Geophysical Research Abstract, 10, EGU2008-A-06674, 2008. ; Pascal, M.-L., Di Muro, A., Boudouma, O., Fointeilles, M., Principe, C. (2008): Zirconolite, calzirtite, baddeleyite, betafite, geikielite and qandilite in skarn ejecta from Vesuvius - inferences for the magma-wallrock interactions. EGU General Assembly 2008. Geophysical Research Abstract, 10, EGU2008-A-06674, 2008.
          • Monte Somma
            • Ercolano
              • San Vito
    		Gentile P. (1986) - Geikielite del M. Somma (NA) e del M. dei tre Abati (PC) - Riv. Miner. Ital., Milano, fasc. 3, pp. 127-130
    • Emilia-Romagna
      • Piacenza Province
        • Coli
    		Gentile P. (1986) - Geikielite del M. somma (Na) e del M. dei tre Abati (Pc) - Riv. Miner. Ital., Milano, fasc.3, pp. 127-130
    • Latium
      • Rome Province
    		Caponera, I., Fiori, S., Pucci, R., & Signoretti, E. (2007). I minerali dei Colli Albani. Un aggiornamento sugli ultimi dieci anni di ricerche. Rivista Mineralogica Italiana, 31 (2), 74-91.
    • Lombardy
      • Sondrio Province
        • Malenco Valley
    		AA. VV., 1996. Collezionare minerali. Hobby & Work
    AA. VV., 1996. Collezionare minerali. Hobby & Work
        • Masino Valley
    		AA. VV., 1996. Collezionare minerali. Hobby & Work
    • Piedmont
      • Verbano-Cusio-Ossola Province
    		The Canadian Mineralogist, Volume 42, Number 6, December 2004, pp. 1825-1845.
    • Trentino-Alto Adige
      • Trento Province
        • Giudicarie Valley
          • Breguzzo
            • San Pietro-Breguzzo Valley
              • Malga Trivena hut
    		Giere, R. & Williams, C.T. (1992)
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Fukushima Prefecture
          • Iwaki
    		Nedachi et al (1984) Ganseki-Koubutsu-Koshogaku Zasshi, 79, 200-213.
    North Korea
     
    • North Hwanghae Province
      • Suan-gun
        • Hol Kol Mine (Holgol; Suan; Namjong)
    		Resource Geology, vol. 50, no. 4, 213-228, 2000
    Pakistan
     
    • Northern Areas
    		http://rruff.geo.arizona.edu/doclib/hom/geikielite.pdf.
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
        • Aldan Shield
          • Torgo River Basin
            • Davan
              • Chara River (Charo River)
      • Transbaikalia (Zabaykalye)
        • Irkutskaya Oblast'
          • Lake Baikal area
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    Slovakia
     
    • Bratislava Region
      • Malé Karpaty Mts
    		Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    South Africa
     
    • Free State Province
      • Jagersfontein
    		Minerals of South Africa
    • Limpopo Province
      • Phalaborwa
        • Loolekop
    		Minerals of South Africa
    • Northern Cape Province
    		http://rruff.geo.arizona.edu/doclib/hom/geikielite.pdf.
    Sri Lanka
     
    • Sabaragamuwa Province
    		Nature (1892) 46, 620; Min.Mag.(1893) 10, 145
      • Ratnapura
    		Nature (1892) 46, 620; Min.Mag.(1893) 10, 145
    USA
     
    • Arizona
      • Cochise Co.
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 230.
    • California
      • Monterey Co.
    		http://rruff.geo.arizona.edu/doclib/hom/geikielite.pdf.
      • Riverside Co.
        • Crestmore
    		[micromounts@yahoogroups.com]
        • Fontana
    		MinRec 15:273-290
    • Massachusetts
      • Middlesex Co.
        • Chelmsford
    		Cook, 1974: Met. Carbonate Rocks of the Nashoba Form.
    • Michigan
    		Mineralogy of Michigan (2004) Heinrich & Robinson
    Mineralogy of Michigan (2004) Heinrich & Robinson
    Mineralogy of Michigan (2004) Heinrich & Robinson
    Zimbabwe
     
    • Masvingo
    		http://rruff.geo.arizona.edu/doclib/hom/geikielite.pdf.
    Mineral and/or Locality
    Google
     
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