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Sodicgedrite

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Formula:
{Na}{Mg
 
2
}{Mg
 
3
Al
 
2
}(Al
 
3
Si
 
5
O
 
22
)(OH)
 
2
Formula is redefined in the 2012 amphibole nomenclature.
System:OrthorhombicColour:nd
Lustre:VitreousHardness:5½ - 6
Member of:Magnesium-iron-manganese Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Name:Named as the sodium-bearing and magnesium-dominant orthoamphibole resembling gedrite.


In order to better distinguish between amphibole end-member member compositions, the CNMNC has decided to rename sodic-gedrite. The name is not yet (Nov 2012) decided.


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 2012
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
 
3
Al
 
2
}(Al
 
3
Si
 
5
O
 
22
)(OH)
 
2


Formula is redefined in the 2012 amphibole nomenclature.
Simplified for copy/paste:{Na}{Mg2}{Mg3Al2}(Al3Si5O22)(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:Magnesium-iron-manganese Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Other Members of Group:

- +
Anthophyllite Group
☐{X
 
2
}{Z
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
Cummingtonite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
Gedrite Group
☐{X
2+
2
}{Z
2+
3
Z
3+
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
Grunerite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Manganocummingtonite
☐{Mn
2+
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
Manganogrunerite
☐{Mn
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Sodic-ferro-anthophyllite
{Na}{Fe
2+
2
}{Fe
2+
5
}(AlSi
 
7
O
 
22
)(OH)
 
2
Sodic-ferrogedrite
{Na}{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
3
Si
 
5
O
 
22
)(OH)
 
2
Sodicanthophyllite
{Na}{Mg
 
2
}{Mg
 
5
}(AlSi
 
7
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.05Ferro-gedrite
☐{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.05Proto-mangano-ferro-anthophyllite
☐{Mn
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Sodicanthophyllite
{Na}{Mg
 
2
}{Mg
 
5
}(AlSi
 
7
O
 
22
)(OH)
 
2
9.DD.05Sodic-ferro-anthophyllite
{Na}{Fe
2+
2
}{Fe
2+
5
}(AlSi
 
7
O
 
22
)(OH)
 
2
9.DD.05Sodic-ferrogedrite
{Na}{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
3
Si
 
5
O
 
22
)(OH)
 
2
9.DD.05Ferro-holmquistite
☐{Li
 
2
}{Fe
2+
3
Al
 
2
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Proto-anthophyllite
☐{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

Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch (2012): Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97, pages 2031–2048

Best Localities for Sodicgedrite

Best of Species:Sodicgedrite

Internet Links for Sodicgedrite

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

    (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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