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Chloritoid

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Hualien Co., Taiwan Province, Taiwan

Show Chloritoid Photos (7)
Formula:
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
[O|(OH)
 
2
|SiO
 
4
]
System:MonoclinicColour:dark green to green-gray ...
Hardness:6½


Chloritoid Group. Carboirite-Chloritoid Series.

Classification of Chloritoid

IMA status:Approved
Strunz 8th edition ID:8/B.24-20
Nickel-Strunz 10th (pending) edition ID:9.AF.85

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
Dana 8th edition ID:52.3.3.1

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.:16.19.6

16 : Silicates Containing Aluminum and other Metals
19 : Aluminosilicates of Fe and Mg
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Type Occurrence of Chloritoid

Type Locality:Kosoi Brod Village, Ekaterinburg (Sverdlovsk), Ekaterinburgskaya (Sverdlovskaya) Oblast', Middle Urals, Urals Region, Russia

Physical Properties of Chloritoid

Lustre:Vitreous, Pearly
Diaphaneity (Transparency):Translucent
Colour:dark green to green-gray or nearly black.
Hardness (Mohs):6½
Cleavage:Perfect
{001} perfect, {110} good.
Density (measured):3.4 - 3.8 g/cm3

Crystallography of Chloritoid

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b (B1 1 2/b) [C2/c] {C1 2/c 1}
Cell Parameters:a = 9.48Å, b = 5.48Å, c = 18.18Å
Ratio:a:b:c = 1.73 : 1 : 3.318
Unit Cell Volume:V 0.00 ų (Calculated from Unit Cell)
Z:8
Morphology:Thin to thick foliated plates or as massive aggremates. Seldom as pseudohexagonal tabular crystals.

Also triclinic.
Twinning:Often twinned.

Optical Data of Chloritoid

Type:Biaxial (+)
RI values: nα = 1.713 - 1.730 nβ = 1.719 - 1.734 nγ = 1.723 - 1.740
2V:Measured: 36° to 89°, Calculated: 78° to 80°
Maximum Birefringence:δ = 0.010

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

Chemical Properties of Chloritoid

Formula:
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
[O|(OH)
 
2
|SiO
 
4
]
Essential elements:Al, Fe, H, O, Si
All elements listed in formula:Al, Fe, H, Mg, Mn, O, Si

Relationship of Chloritoid to other Species

Series:Forms a series with Carboirite (see here)
Related to:
  • Chloritoid Group
    • Related Minerals - Nickel-Strunz Grouping):

    - +
    9.AF.05Sillimanite
    Al
     
    2
    		[O|SiO
     
    4
    		]
    9.AF.10Andalusite
    Al
     
    2
    		[O|SiO
     
    4
    		]
    9.AF.10Kanonaite
    Mn
    3+
     
    		Al[O|SiO
     
    4
    		]
    9.AF.15Kyanite
    Al
     
    2
    		[O|SiO
     
    4
    		]
    9.AF.20Mullite
    Al
     
    8
    		[(O,OH,F)|(Si,Al)O
     
    4
    		]
     
    4
    9.AF.20Krieselite
    (Al,Ga)
     
    2
    		[(OH)
     
    2
    		|GeO
     
    4
    		]
    9.AF.23Boromullite
    Al
     
    9
    		Si
     
    2
    		BO
     
    19
    9.AF.25Yoderite
    Mg(Al,Fe
    3+
     
    		)
     
    3
    		[O|OH|(SiO
     
    4
    		)
     
    2
    		]
    9.AF.30Magnesiostaurolite
    (Mg,Li,Fe
    2+
     
    		)
     
    1.5-2
    		Al
     
    9
    		[O
     
    6
    		|(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
    9.AF.30Staurolite
    (Fe
    2+
     
    		,Mg,Zn)
     
    1.5-2
    		Al
     
    9
    		[O
     
    6
    		|(OH,O)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
    9.AF.30Zincostaurolite
    (Zn,Li,Fe
    2+
     
    		,Mg)
     
    <2
    		Al
     
    9
    		[O
     
    6
    		|(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
    9.AF.35Topaz
    Al
     
    2
    		[(F,OH)
     
    2
    		|SiO
     
    4
    		]
    9.AF.40Norbergite
    Mg
     
    3
    		[(F,OH)
     
    2
    		|SiO
     
    4
    		]
    9.AF.45Alleghanyite
    Mn
    2+
    5
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    2
    		]
    9.AF.45Chondrodite
    (Mg,Fe
    2+
     
    		)
     
    5
    		[(F,OH)
     
    2
    		|(SiO
     
    4
    		)
     
    2
    		]
    9.AF.45Reinhardbraunsite
    Ca
     
    5
    		[(OH,F)
     
    2
    		|(SiO
     
    4
    		)
     
    2
    		]
    9.AF.45IMA2008-045
    Ca
     
    5
    		(SiO
     
    4
    		)
     
    2
    		F
     
    2
    9.AF.50Humite
    (Mg,Fe
    2+
     
    		)
     
    7
    		[(F,OH)
     
    2
    		|(SiO
     
    4
    		)
     
    3
    		]
    9.AF.50Manganhumite
    (Mn
    2+
     
    		,Mg)
     
    7
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    3
    		]
    9.AF.55Clinohumite
    (Mg,Fe
    2+
     
    		)
     
    9
    		[(F,OH)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
    9.AF.55Sonolite
    Mn
    2+
    9
    		[(OH,F)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
    9.AF.55Hydroxylclinohumite
    Mg
     
    9
    		[(OH,F)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
    9.AF.60Leucophoenicite
    Mn
    2+
    7
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    3
    		]
    9.AF.65Ribbeite
    (Mn
    2+
     
    		,Mg)
     
    5
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    2
    		]
    9.AF.70Jerrygibbsite
    Mn
    2+
    9
    		[(OH)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
    9.AF.75Franciscanite
    Mn
    2+
    6
    		(V
    5+
     
    		,[])
     
    2
    		[(O,OH)
     
    3
    		|SiO
     
    4
    		]
     
    2
    9.AF.75Örebroite
    Mn
    2+
    3
    		(Fe
    3+
     
    		,Sb
    5+
     
    		)[(O,OH)
     
    3
    		|SiO
     
    4
    		]
    9.AF.75Welinite
    Mn
    2+
    6
    		(W
    6+
     
    		,Mg)
     
    2
    		[(O,OH)
     
    3
    		|SiO
     
    4
    		]
     
    2
    9.AF.80Ellenbergerite
    Mg
     
    6
    		Al
     
    6
    		Ti[(OH)
     
    6
    		|(HSiO
     
    4
    		)
     
    4
    		|(SiO
     
    4
    		)
     
    4
    		]
    9.AF.85Magnesiochloritoid
    MgAl
     
    2
    		[O|(OH)
     
    2
    		|SiO
     
    4
    		]
    9.AF.85Ottrélite
    (Mn
    2+
     
    		,Fe
    2+
     
    		,Mg)Al
     
    2
    		[O|(OH)
     
    2
    		|SiO
     
    4
    		]
    9.AF.90Poldervaartite
    CaCa[SiO
     
    3
    		OH](OH)
    9.AF.90Olmiite
    CaMn
    2+
     
    		[SiO
     
    3
    		(OH)](OH)
    Related Minerals - Hey's Index Grouping:

    - +
    16.19.1Indialite
    Mg
     
    2
    		Al
     
    4
    		Si
     
    5
    		O
     
    18
    16.19.2Cordierite
    (Mg,Fe)
     
    2
    		Al
     
    4
    		Si
     
    5
    		O
     
    18
    16.19.3Sekaninaite
    (Fe,Mg)
     
    2
    		Al
     
    4
    		Si
     
    5
    		O
     
    18
    16.19.4Ferrogedrite
    ☐[Fe
    2+
    2
    		][Fe
    2+
    3
    		Al
     
    2
    		][(OH)
     
    2
    		|Al
     
    2
    		Si
     
    6
    		O
     
    22
    		]
    16.19.5Staurolite
    (Fe
    2+
     
    		,Mg,Zn)
     
    1.5-2
    		Al
     
    9
    		[O
     
    6
    		|(OH,O)
     
    2
    		|(SiO
     
    4
    		)
     
    4
    		]
    16.19.7Amesite
    Mg
     
    2
    		Al[(OH)
     
    4
    		|AlSiO
     
    5
    		]
    16.19.8Corundophilite
    (Mg,Fe,Al)
     
    6
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    8
    16.19.9Yoderite
    Mg(Al,Fe
    3+
     
    		)
     
    3
    		[O|OH|(SiO
     
    4
    		)
     
    2
    		]
    16.19.10Delessite
    (Mg,Fe,Fe,Al)(Si,Al)
     
    4
    		O
     
    10
    		(O,OH)
     
    8
    16.19.11Ferrocarpholite
    (Fe
    2+
     
    		,Mg)Al
     
    2
    		[(OH)
     
    4
    		|Si
     
    2
    		O
     
    6
    		]
    16.19.12Magnesiocarpholite
    (Mg,Fe
    2+
     
    		)Al
     
    2
    		[(OH)
     
    4
    		|Si
     
    2
    		O
     
    6
    		]
    16.19.13Chamosite
    (Fe
    2+
     
    		,Mg)
     
    5
    		Al[(OH)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
    16.19.14Orthochamosite
    (Fe,Mg,Fe)
     
    5
    		Al(Si
     
    3
    		Al)O
     
    10
    		(OH,O)
     
    8
    16.19.15Berthierine
    (Fe,Fe,Mg)
     
    2-3
    		(Si,Al)
     
    2
    		O
     
    5
    		(OH)
     
    4
    16.19.16Odinite
    (Fe,Mg,Al,Fe,Ti,Mn)
     
    2.4
    		(Si,Al)
     
    2
    		O
     
    5
    		(OH)
     
    4
    16.19.17Clinochlore
    (Mg,Fe
    2+
     
    		)
     
    5
    		Al[(OH)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
    16.19.18Gedrite
    ☐[Mg
     
    2
    		][Mg
     
    3
    		Al
     
    2
    		][(OH)
     
    2
    		|Al
     
    2
    		Si
     
    6
    		O
     
    22
    		]
    16.19.19Magnesiogedrite
    16.19.20Diabantite
    (Mg,Fe,Al)
     
    6
    		(Si,Al)
     
    4
    		O
     
    10
    		(OH)
     
    8
    16.19.21Sudoite
    (Mg,Fe
    2+
     
    		)
     
    2
    		Al
     
    3
    		[(OH)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
    16.19.22Vermiculite
    (Mg,Fe,Al)
     
    3
    		(Al,Si)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·4H
     
    2
    		O
    16.19.23Corrensite
    (Mg,Fe)
     
    9
    		(Si,Al)
     
    8
    		O
     
    20
    		(OH)
     
    10
    		·nH
     
    2
    		O

    Other Names for Chloritoid

    Synonyms:
    BarytophylliteBliabergiteBliabergsiteChlorite sparChloritoidite
    SismondineSismonditeStrüverite (of Brezina)
    Other Languages:
    German:Barytophyllit
    Bliabergit
    Bliabergsit
    Chloritoidit
    Chloritspat
    Sismondit
    Russian:Хлоритоид
    Spanish:Barytophyllita
    Bliabergita
    Bliabergsita
    Chloritoidita
    Sismondita
    Varieties:
    Masonite

    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 Chloritoid

    Reference List:Acta Crystallographica: B31: 780.

    American Mineralogist (1980): 65: 534-539.

    Theye, T., Seidel, E., and Vidal, O. (1992) Carpholite, sudoite, chloritoid in low-grade high-pressure metapelites from Crete and the Peloponnese, Greece. European Journal of Mineralogy: 4: 487-507.

    Theye, T. (2000) New experimental high pressure data on chloritoid and carpholite. Beiheft No. 1, European Journal of Mineralogy: 12: 212.

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    Localities for Chloritoid

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