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Carmichaelite

Formula:
(Ti,Cr,Fe)[O
 
2-x
(OH)
 
x
]
System:MonoclinicLustre:Metallic
Hardness:6
Name:Named for Ian S. E. Charmchael, Professor of Geology at the University of California, Berkeley, in recognition
This page provides mineralogical data about Carmichaelite.

Classification of Carmichaelite

IMA status:Approved
Nickel-Strunz 10th (pending) edition ID: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
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Type Occurrence of Carmichaelite

Type Locality:Garnet Ridge, Dinnehotso, Monument Valley, Navajo Indian Reservation, Apache Co., Arizona, USA

Physical Properties of Carmichaelite

Lustre:Metallic
Hardness (Mohs):6

Crystallography of Carmichaelite

Crystal System:Monoclinic

Optical Data of Carmichaelite

Type:Biaxial
Dispersion:r > v strong

Chemical Properties of Carmichaelite

Formula:
(Ti,Cr,Fe)[O
 
2-x
(OH)
 
x
]
Essential elements:H, O, Ti
All elements listed in formula:Cr, Fe, H, O, Ti

Relationship of Carmichaelite to other Species

Related Minerals - Nickel-Strunz Grouping):
4.DB.05Argutite
GeO
 
2
4.DB.05Cassiterite
SnO
 
2
4.DB.05Plattnerite
PbO
 
2
4.DB.05Pyrolusite
MnO
 
2
4.DB.05Rutile
TiO
 
2
4.DB.05Tripuhyite
Fe
3+
 
Sb
5+
 
O
 
4
4.DB.05Tugarinovite
MoO
 
2
4.DB.05Varlamoffite
(Sn,Fe)(O,OH)
 
2
4.DB.10Byströmite
MgSb
 
2
O
 
6
4.DB.10Tapiolite-(Fe)
(Fe,Mn)(Ta,Nb)
 
2
O
 
6
4.DB.10Tapiolite-(Mn)
(Mn,Fe)(Ta,Nb)
 
2
O
 
6
4.DB.10Ordoñezite
ZnSb
 
2
O
 
6
4.DB.15Akhtenskite
ε-Mn
4+
 
O
 
2
4.DB.15Nsutite
(Mn
4+
 
,Mn
2+
 
)(O,OH)
 
2
4.DB.15Paramontroseite
VO
 
2
4.DB.15Ramsdellite
Mn
4+
 
O
 
2
4.DB.20Scrutinyite
alpha-PbO
 
2
4.DB.25Ishikawaite
U
4+
 
Fe
2+
 
Nb
 
2
O
 
8
4.DB.25Ixiolite
(Ta,Nb,Sn,Fe,Mn)
 
4
O
 
8
4.DB.25Samarskite-(Y)
(Y,Fe
3+
 
,Fe
2+
 
,U,Th,Ca)
 
2
(Nb,Ta)
 
2
O
 
8
4.DB.25Srilankite
Ti
 
2
ZrO
 
6
4.DB.25Yttrocolumbite-(Y)
Y(U
4+
 
,Fe
2+
 
)Nb
 
2
O
 
8
4.DB.25Calciosamarskite
(Ca,Fe
3+
 
,Y)
 
2
(Nb,Ta,Ti)
 
2
O
 
8
4.DB.25Iwashiroite-(Y)
Y(Ta,Nb)O
 
4
4.DB.25Samarskite-(Yb)
(Yb,Fe
3+
 
)
 
2
(Nb,Ta)
 
2
O
 
8
4.DB.25Písekite-(Y)
4.DB.30Ferberite
FeWO
 
4
4.DB.30Hübnerite
MnWO
 
4
4.DB.30Sanmartinite
(Zn,Fe)WO
 
4
4.DB.30Krasnoselskite
CoWO
 
4
4.DB.35Columbite-(Fe)
FeNb
 
2
O
 
6
4.DB.35Tantalite-(Fe)
FeTa
 
2
O
 
6
4.DB.35Columbite-(Mn)
(Mn,Fe)(Nb,Ta)
 
2
O
 
6
4.DB.35Tantalite-(Mn)
MnTa
 
2
O
 
6
4.DB.35Columbite-(Mg)
(Mg,Fe,Mn)(Nb,Ta)
 
2
O
 
6
4.DB.35Qitianlingite
(Fe,Mn)
 
2
(Nb,Ta)
 
2
WO
 
10
4.DB.35Magnocolumbite
4.DB.35Tantalite-(Mg)
(Mg,Fe
2+
 
)(Ta,Nb)
 
2
O
 
6
4.DB.40Ferrowodginite
FeSnTa
 
2
O
 
8
4.DB.40Lithiotantite
Li(Ta,Nb)
 
3
O
 
8
4.DB.40Lithiowodginite
LiTa
 
3
O
 
8
4.DB.40Titanowodginite
MnTiTa
 
2
O
 
8
4.DB.40Wodginite
Mn(Sn,Ta)Ta
 
2
O
 
8
4.DB.40Ferrotitanowodginite
Fe
2+
 
TiTa
 
2
O
 
8
4.DB.45Tivanite
VTiO
 
3
(OH)
4.DB.55Alumotantite
AlTaO
 
4
4.DB.60Biehlite
((Sb,As)O)
 
2
[MoO
 
4
]

Other Names for Carmichaelite

Synonyms:
IMA1996-062
German names:
Carmichaelit
Russian names:
Кармайклит
Spanish names:
Carmichaelita

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 Carmichaelite

Reference List:American Mineralogist: 85: 792-800.

Internet Links for Carmichaelite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Carmichaelite in the Natural History Museum (London) online catalogue
  • Carmichaelite details from Handbook of Mineralogy (PDF)
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    Localities for Carmichaelite

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    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.
    USA
     
    • 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.
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