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Carmichaelite

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Formula:
(Ti,Cr,Fe)[O2-x(OH)x]
System:
Monoclinic
Colour:
cinnamon brown
Lustre:
Metallic
Hardness:
6
Name:
Named for Ian S. E. Carmichael (March 29th, 1930 - August 26th, 2011), 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.
This page provides mineralogical data about Carmichaelite.


Classification of Carmichaelite

Approved
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

Type Occurrence of Carmichaelite

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:

Physical Properties of Carmichaelite

Metallic
Diaphaneity (Transparency):
Translucent
Colour:
cinnamon brown
Hardness (Mohs):
6
Tenacity:
Brittle
Cleavage:
None Observed
Density:
4.13 g/cm3 (Calculated)

Crystallography of Carmichaelite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group 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 Volume:
V 708.51 ų (Calculated from Unit Cell)
Z:
22
X-Ray 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)

Optical Data of Carmichaelite

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

Chemical Properties of Carmichaelite

Formula:
(Ti,Cr,Fe)[O2-x(OH)x]
All elements listed in formula:

Relationship of Carmichaelite to other Species

4.DB.05ArgutiteGeO2
4.DB.05CassiteriteSnO2
4.DB.05PlattneritePbO2
4.DB.05PyrolusiteMnO2
4.DB.05RutileTiO2
4.DB.05TripuhyiteFe3+Sb5+O4
4.DB.05TugarinoviteMoO2
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb2O6
4.DB.10Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6
4.DB.10Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6
4.DB.10OrdoñeziteZnSb2O6
4.DB.15bAkhtenskiteε-Mn4+O2
4.DB.15cNsutite(Mn4+,Mn2+)(O,OH)2
4.DB.15aParamontroseiteV4+O2
4.DB.15aRamsdelliteMn4+O2
4.DB.20Scrutinyiteα-PbO2
4.DB.25IshikawaiteU4+Fe2+Nb2O8
4.DB.25Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
4.DB.25Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
4.DB.25SrilankiteZrTi2O6
4.DB.25Yttrocolumbite-(Y)Y(U4+,Fe2+)Nb2O8
4.DB.25Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8
4.DB.25Samarskite-(Yb)(Yb,Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
4.DB.30FerberiteFeWO4
4.DB.30HübneriteMnWO4
4.DB.30Sanmartinite(Zn,Fe)WO4
4.DB.30KrasnoselskiteCoWO4
4.DB.30HeftetjerniteScTaO4
4.DB.30HuanzalaiteMgWO4
4.DB.35Columbite-(Fe)FeNb2O6
4.DB.35Tantalite-(Fe)FeTa2O6
4.DB.35Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
4.DB.35Tantalite-(Mn)MnTa2O6
4.DB.35Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)(Mg,Fe2+)(Ta,Nb)2O6
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8
4.DB.40LithiotantiteLiTa3O8
4.DB.40LithiowodginiteLiTa3O8
4.DB.40TitanowodginiteMn2+TiTa2O8
4.DB.40WodginiteMn2+Sn4+Ta2O8
4.DB.40FerrotitanowodginiteFe2+TiTa2O8
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteV3+TiO3(OH)
4.DB.55AlumotantiteAlTaO4
4.DB.60Biehlite((Sb,As)O)2[MoO4]

Other Names for Carmichaelite

Name in Other Languages:

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 Carmichaelite

Reference List:
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 Carmichaelite

mindat.org URL:
http://www.mindat.org/min-6849.html
Please feel free to link to this page.

Localities for Carmichaelite

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.
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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