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Sodicgedrite

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Formula:
{Na}{Mg2}{Mg3Al2}(Al3Si5O22)(OH)2
Formula is redefined in the 2012 amphibole nomenclature.
System:
Orthorhombic
Colour:
nd
Lustre:
Vitreous
Hardness:
5½ - 6
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

Approved 2012
9.DD.05

9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles
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

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

Crystallography of Sodicgedrite

Crystal System:
Orthorhombic

Chemical Properties of Sodicgedrite

Formula:
{Na}{Mg2}{Mg3Al2}(Al3Si5O22)(OH)2

Formula is redefined in the 2012 amphibole nomenclature.
Essential elements:
All elements listed in formula:

Relationship of Sodicgedrite to other Species

Series:
Forms a series with Sodic-ferrogedrite (see here)
Other Members of Group:
Anthophyllite Root Name☐{X2}{Z5}(Si8O22)(OH)2
Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
Gedrite Root Name☐{X22+}{Z32+Z23+}(Al2Si6O22)(OH)2
Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
Manganocummingtonite☐{Mn22+}{Mg5}(Si8O22)(OH)2
Manganogrunerite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
Proto-ferro-suenoite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
Sodic-ferro-anthophyllite{Na}{Fe22+}{Fe52+}(AlSi7O22)(OH)2
Sodic-ferrogedrite{Na}{Fe22+}{Fe32+Al2}(Al3Si5O22)(OH)2
Sodicanthophyllite{Na}{Mg2}{Mg5}(AlSi7O22)(OH)2
9.DD.05Ferro-anthophyllite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
9.DD.05Ferro-gedrite☐{Fe22+}{Fe32+Al2}(Al2Si6O22)(OH)2
9.DD.05Gedrite☐{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2
9.DD.05Holmquistite☐{Li2}{Mg3Al2}(Si8O22)(OH)2
9.DD.05Proto-ferro-suenoite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
9.DD.05Sodicanthophyllite{Na}{Mg2}{Mg5}(AlSi7O22)(OH)2
9.DD.05Sodic-ferro-anthophyllite{Na}{Fe22+}{Fe52+}(AlSi7O22)(OH)2
9.DD.05Sodic-ferrogedrite{Na}{Fe22+}{Fe32+Al2}(Al3Si5O22)(OH)2
9.DD.05Ferro-holmquistite☐{Li2}{Fe32+Al2}(Si8O22)(OH)2
9.DD.05Proto-anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2

Other Names for Sodicgedrite

Name in Other Languages:

Other Information

Health Risks:
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

Internet Links for Sodicgedrite

Localities for Sodicgedrite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
  • Sogn og Fjordane
    • Selje
      • Årsheim
Smith, D. S.(1988): Eclogites and Eclogite Facies Rocks. Elsevier Science Limited, 1988. 524p. (p.51)
Mineral and/or Locality  
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