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Carboirite

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Formula:
FeAl
 
2
(GeO
 
4
)O(OH)
 
2
System:TriclinicColour:Green
Lustre:VitreousHardness:6
Member of:Chloritoid Group
Name:Named after the type locality, Carboire, Ariège, Midi-Pyrénées, France.

Classification of Carboirite

IMA status:Approved
Strunz 8th edition ID:4/C.22-10
Nickel-Strunz 10th (pending) edition ID:9.J0.05

9 : SILICATES (Germanates)
J : Germanates
0 :
Dana 8th edition ID:52.3.3.4

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Hey's CIM Ref.:7.11.17

7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
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Type Occurrence of Carboirite

Type Locality:Carboire, Ariège, Midi-Pyrénées, France
Year of Discovery:1983

Physical Properties of Carboirite

Lustre:Vitreous
Colour:Green
Hardness (Mohs):6

Crystallography of Carboirite

Crystal System:Triclinic
Cell Parameters:a = 9.51Å, b = 5.56Å, c = 9.29Å
α = 96.08°, β = 101.52°, γ = 89.45°
Ratio:a:b:c = 1.71 : 1 : 1.671
Unit Cell Volume:V 478.58 ų (Calculated from Unit Cell)
Twinning:Polysynthetic twinning // to (001).

Optical Data of Carboirite

Type:Biaxial (+)
RI values: nα = 1.731 nβ = 1.735 nγ = 1.740
2V:Measured: 65° to 70°
Maximum Birefringence:δ = 0.009

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Carboirite

Formula:
FeAl
 
2
(GeO
 
4
)O(OH)
 
2
Simplified for copy/paste:FeAl2(GeO4)O(OH)2
Essential elements:Al, Fe, Ge, H, O
All elements listed in formula:Al, Fe, Ge, H, O

Relationship of Carboirite to other Species

Series:Forms a series with Chloritoid (see here)
Member of:Chloritoid Group
Other Members of Group:

- +
Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
(SiO
 
4
)O(OH)
 
2
Magnesiochloritoid
MgAl
 
2
(SiO
 
4
)O(OH)
 
2
Ottrélite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
(SiO
 
4
)O(OH)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
9.J0.10Bartelkeite
PbFe
2+
 
Ge
 
3
O
 
8
9.J0.15Otjisumeite
PbGe
 
4
O
 
9
Related Minerals - Hey's Index Grouping:

- +
7.11.1Romarchite
SnO
7.11.2Cassiterite
SnO
 
2
7.11.4Schoenfliesite
Mg[Sn(OH)
 
6
]
7.11.5Burtite
Ca[Sn(OH)
 
6
]
7.11.6Vismirnovite
Zn[Sn(OH)
 
6
]
7.11.7Wickmanite
Mn
2+
 
[Sn(OH)
 
6
]
7.11.8Tetrawickmanite
Mn
2+
 
[Sn
4+
 
(OH)
 
6
]
7.11.9Jeanbandyite
(Fe
2+
 
,Mn
2+
 
)[Sn
4+
 
(OH)
 
6
]
7.11.10Natanite
Fe
2+
 
[Sn(OH)
 
6
]
7.11.11Mushistonite
(Cu,Zn,Fe
2+
 
)[Sn(OH)
 
6
]
7.11.12Ferronigerite-2N1S
Sn(Fe,Mg)Al
 
6
O
 
11
(OH)
7.11.13Magnesionigerite
7.11.14Argutite
GeO
 
2
7.11.15Brunogeierite
Fe
2+
2
Ge
4+
 
O
 
4
7.11.16Stottite
Fe
2+
 
[Ge
4+
 
(OH)
 
6
]
7.11.18Otjisumeite
PbGe
 
4
O
 
9
7.11.19Bartelkeite
PbFe
2+
 
Ge
 
3
O
 
8
7.11.20Massicot
PbO
7.11.21Litharge
PbO
7.11.22Minium
Pb
 
3
O
 
4
7.11.23Plattnerite
PbO
 
2
7.11.24Scrutinyite
alpha-PbO
 
2
7.11.25Murdochite
PbCu
 
6
O
 
8-x
(Cl,Br)
 
2x
where x<=0.5
7.11.26Macedonite
PbTiO
 
3
7.11.27Cesàrolite
Pb(Mn
4+
 
)
 
3
O
 
6
(OH)
 
2
7.11.28Coronadite
Pb(Mn
4+
6
Mn
3+
2
)O
 
16
7.11.29Quenselite
PbMnO
 
2
(OH)
7.11.30Plumboferrite
Pb
 
2
Fe
3+
11-x
Mn
2+
x
O
 
19-2x
, x = 1/3
7.11.31Magnetoplumbite
(Pb,Mn)(Fe,Mn)
 
12
O
 
19
7.11.32Senaite
Pb(Ti,Fe,Mn)
 
21
O
 
38

Other Names for Carboirite

Synonyms:
IMA1980-066
Other Languages:
German:Carboirit
Spanish:Carboirita

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 Carboirite

Reference List:

- +
Johan, Z.; Oudin, E. & Picot, P. (1983): Germanium and gallium analogs of silicates and oxides from zinc deposits of the French central Pyrenees; argutite and carboirite, two new mineral species. Tschermaks Mineralogische und Petrographische Mitteilungen 31, 97-119. (in French)

American Mineralogist: 69: 406.

Internet Links for Carboirite

Search Engines:
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  • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
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  • Localities for Carboirite

    (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.
    France
     
    • Midi-Pyrénées
      • Ariège
    [Tschermaks Min.Petr.Mitt.(1983) 31, 97-119; Nickel & Nichols, 1991 - "Mineral Reference Manual" p35]
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