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Sodicgedrite

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Ærøy Island, Arendal, Aust-Agder, Norway
© Jan Kihle

Discuss Sodicgedrite



Formula:
{Na}{Mg
 
2
}{Mg
 
4
Al}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
System:OrthorhombicColour:nd
Lustre:VitreousHardness:5½ - 6
Member of:Mg-Fe-Mn-Li Ortho-Amphibole Subgroup > Amphibole Group
Name:Named as a sodium-bearing, magnesium-dominant member of the gedrite series.


Amphibole Group, Mg-Fe-Mn-Li Ortho-Amphibole Subgroup.

Indicator mineral for Ultra High temperature (UHT) granulite facies metamorphism in Mg-Al rich rocks (e.g., metapelites).

Classification of Sodicgedrite

IMA status:Approved
Strunz 8th edition ID:8/F.12-80
Nickel-Strunz 10th (pending) edition ID:9.DD.05

9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles
Dana 8th edition ID:66.1.2.8

66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
1 : Amphiboles - Mg-Fe-Mn-Li subgroup
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Physical Properties of Sodicgedrite

Lustre:Vitreous
Colour:nd
Streak:nd
Hardness (Mohs):5½ - 6

Crystallography of Sodicgedrite

Crystal System:Orthorhombic

Chemical Properties of Sodicgedrite

Formula:
{Na}{Mg
 
2
}{Mg
 
4
Al}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
Essential elements:Al, H, Mg, Na, O, Si
All elements listed in formula:Al, H, Mg, Na, O, Si

Relationship of Sodicgedrite to other Species

Series:Forms a series with Sodic-ferrogedrite (see here)
Member of:Mg-Fe-Mn-Li Ortho-Amphibole Subgroup > Amphibole Group
Other Members of Group:

- +
Anthophyllite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
Ferro-anthophyllite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Ferrogedrite
☐{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
Gedrite
☐{Mg
 
2
}{Mg
 
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
Holmquistite
☐{Li
 
2
}{Mg
 
3
Al
 
2
}(Si
 
8
O
 
22
)(OH)
 
2
Protoferro-anthophyllite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Protomangano-ferro-anthophyllite
☐{Mn
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Sodic-ferro-anthophyllite
{Na}{NaFe
2+
 
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Sodic-ferrogedrite
{Na}{Fe
2+
2
}{Fe
2+
4
Al}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
Sodicanthophyllite
{Na}{NaMg}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
9.DD.05Ferro-anthophyllite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Ferrogedrite
☐{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
9.DD.05Gedrite
☐{Mg
 
2
}{Mg
 
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
9.DD.05Holmquistite
☐{Li
 
2
}{Mg
 
3
Al
 
2
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Protoferro-anthophyllite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Protomangano-ferro-anthophyllite
☐{Mn
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Sodicanthophyllite
{Na}{NaMg}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Sodic-ferro-anthophyllite
{Na}{NaFe
2+
 
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Sodic-ferrogedrite
{Na}{Fe
2+
2
}{Fe
2+
4
Al}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
9.DD.05Ferroholmquistite
☐{Li
 
2
}{Fe
2+
3
Al
 
2
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Protoanthophyllite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2

Other Names for Sodicgedrite

Synonyms:
Na GedriteSodium Gedrite
Other Languages:
German:Na-Gedrit
Natriumgedrit
Spanish:Sodicgedrita

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 Sodicgedrite

Reference List:

- +
Hawthorne F.C. (1983): Canadian Mineralogist: 21: 173.

Mineralogical Record: 29: 169-174.

Hawthorne, F. C. and Oberti, R. (2006): On the classification of amphiboles: Canadian Mineralogist 44, 1-21.

Kanazawa, T., Tsunogae, T., Sato, K. & Santosh, M. (2008): The stability and origin of sodicgedrite in ultrahigh-temperature Mg-Al granulites: a case study from the Gondwana suture in southern India. Contributions to Mineralogy and Petrology, 157, 95-110

Internet Links for Sodicgedrite

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    • Localities for Sodicgedrite

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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.
    Norway
     
    • Aust-Agder
      • Arendal
    		Jan Kihle photo and pers. commentary 2010
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