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Carmichaelite

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Ian S. E. Carmichael
Formula:
(Ti,Cr,Fe)[O2-x(OH)x]
Colour:
cinnamon brown
Lustre:
Metallic
Hardness:
6
Specific Gravity:
4.13 (Calculated)
Crystal System:
Monoclinic
Name:
Named by L. Wang, R.C. Rouse, E.J. Essene, D.R. Peacor, and Y. Zhang in 2000 for Ian S. E. Carmichael (29 March 1930, London, England - 26 August 2011, Berkeley, California, USA), Professor of Geology at the University of California, Berkeley, in recognition of his numerous contributions to mineralogy and petrology, especially his studies of iron-titanium oxides from volcanic and mantle settings.
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Classification of CarmichaeliteHide

Approved
Approval Year:
1996
First Published:
2000
4.DB.50

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra

Physical Properties of CarmichaeliteHide

Metallic
Transparency:
Translucent
Colour:
cinnamon brown
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Density:
4.13 g/cm3 (Calculated)

Optical Data of CarmichaeliteHide

Type:
Biaxial
Dispersion:
r > v strong
Colour in reflected light:
gray to white

Chemical Properties of CarmichaeliteHide

Formula:
(Ti,Cr,Fe)[O2-x(OH)x]
IMA Formula:
(Ti,Cr,Fe)(O,OH)2

Crystallography of CarmichaeliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 7.706(1) Å, b = 4.5583(6) Å, c = 20.187(3) Å
β = 92.334(2)°
Ratio:
a:b:c = 1.691 : 1 : 4.429
Unit Cell V:
708.51 ų (Calculated from Unit Cell)
Z:
22

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.842 (100)
3.773 (94)
2.664 (70)
1.688 (54)
1.679 (44)
1.661 (44)
1.648 (34)

Type Occurrence of CarmichaeliteHide

General Appearance of Type Material:
Anhedral to subhedral crystals
Place of Conservation of Type Material:
National Museum of Natural History, Smithsonian Institution (catalogue number NMNH 172011.)
Geological Setting of Type Material:
Inclusions in pyrope in serpentinized ultramafic microbreccias containing comminuted crustal rocks and mantle xenoliths
Associated Minerals at Type Locality:

Synonyms of CarmichaeliteHide

Other Language Names for CarmichaeliteHide

Related Minerals - Nickel-Strunz GroupingHide

4.DB.05ArgutiteGeO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05CassiteriteSnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05PlattneritePbO2Tet. 4/mmm (4/m 2/m 2/m)
4.DB.05PyrolusiteMnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05RutileTiO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05TripuhyiteFe3+Sb5+O4Tet.
4.DB.05TugarinoviteMoO2Mon.
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb2O6Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
4.DB.10Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.10Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.10OrdoñeziteZnSb2O6Tet.
4.DB.15bAkhtenskiteε-Mn4+O2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
4.DB.15cNsutite(Mn4+,Mn2+)(O,OH)2Hex.
4.DB.15aParamontroseiteV4+O2Orth.
4.DB.15aRamsdelliteMn4+O2Orth. mmm (2/m 2/m 2/m)
4.DB.20Scrutinyiteα-PbO2Orth.
4.DB.25IshikawaiteU4+Fe2+Nb2O8Mon.
4.DB.25Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8Orth.
4.DB.25Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.25SrilankiteZrTi2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.25Yttrocolumbite-(Y)Y(U4+,Fe2+)Nb2O8
4.DB.25Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8Mon.
4.DB.25Samarskite-(Yb)(Yb,Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Mon. 2/m : P2/b
4.DB.30FerberiteFeWO4Mon. 2/m : P2/b
4.DB.30HübneriteMnWO4Mon. 2/m : P2/b
4.DB.30Sanmartinite(Zn,Fe)WO4Mon. 2/m : P21/b
4.DB.30KrasnoselskiteCoWO4Mon.
4.DB.30HeftetjerniteScTaO4Mon. 2/m
4.DB.30HuanzalaiteMgWO4Mon. 2/m : P2/b
4.DB.35Columbite-(Fe)FeNb2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Tantalite-(Fe)FeTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Tantalite-(Mn)MnTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6Orth.
4.DB.35Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10Orth.
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)(Mg,Fe2+)(Ta,Nb)2O6Orth. mmm (2/m 2/m 2/m)
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8Mon.
4.DB.40LithiotantiteLiTa3O8Mon.
4.DB.40LithiowodginiteLiTa3O8Mon.
4.DB.40TitanowodginiteMn2+TiTa2O8Mon.
4.DB.40WodginiteMn2+Sn4+Ta2O8Mon.
4.DB.40FerrotitanowodginiteFe2+TiTa2O8Mon.
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteV3+TiO3(OH)Mon.
4.DB.55AlumotantiteAlTaO4Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.60Biehlite((Sb,As)O)2[MoO4]Mon.

Other InformationHide

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 CarmichaeliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Wang, L., Rouse, R.C., Essene, E.J., Peacor, D.R., Zhang, Y. (2000) Carmichaelite, a new hydroxyl-bearing titanite from Garnet Ridge, Arizona. American Mineralogist: 85: 792-800.

Internet Links for CarmichaeliteHide

Localities for CarmichaeliteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Arizona
    • Apache Co.
      • Navajo Indian Reservation
        • Monument Valley
          • Dinnehotso
Wang,L., R.C. Rouse, E.J. Essene, D.R. Peacor, and Y. Zhang (2000) Carmichaelite, a new hydroxyl-bearing titanite from Garnet Ridge, Arizona. American Mineralogist: 85: 792-800; Min.Rec.: 32: 211; Grant, Raymond W., Richard A. Bideaux & Sidney A. Williams (2006), Minerals Added to the Arizona List 1995 to 2005: 3.
  • Utah
    • San Juan Co.
Schulze, D. J., Flemming, R. L., Shepherd, P. H., & Helmstaedt, H. (2014). Mantle-derived guyanaite in a Cr-omphacitite xenolith from Moses Rock diatreme, Utah. American Mineralogist, 99(7), 1277-1283.
Mineral and/or Locality  
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