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Sodicgedrite

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


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Classification of SodicgedriteHide

Notes:
Unnamed (probably valid)
Approval History:
Unnamed, but probably valid.
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

Physical Properties of SodicgedriteHide

Vitreous
Colour:
nd
Streak:
nd
Hardness:
5½ - 6 on Mohs scale

Chemical Properties of SodicgedriteHide

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

Formula is redefined in the 2012 amphibole nomenclature.

Crystallography of SodicgedriteHide

Crystal System:
Orthorhombic

Synonyms of SodicgedriteHide

Other Language Names for SodicgedriteHide

Relationship of Sodicgedrite to other SpeciesHide

Other Members of this group:
Anthophyllite Root Name☐{X2}{Z5}(Si8O22)(OH)2
Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2Mon.
Gedrite Root Name☐{X2+2}{Z2+3Z3+2}(Al2Si6O22)(OH)2Orth.
Grunerite☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2Mon. 2/m : B2/m
Manganocummingtonite☐{Mn2+2}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
Manganogrunerite☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2Mon.
Sodic-ferro-anthophyllite{Na}{Fe2+2}{Fe2+5}(AlSi7O22)(OH)2Orth.
Sodic-ferrogedrite{Na}{Fe2+2}{Fe2+3Al2}(Al3Si5O22)(OH)2Orth.
Sodicanthophyllite{Na}{Mg2}{Mg5}(AlSi7O22)(OH)2Orth.
Suenoite Root Name☐{X2}{Z5}(Si8O22)(OH)2
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Rutile1 photo of Sodicgedrite associated with Rutile on mindat.org.
Orthopyroxene Subgroup1 photo of Sodicgedrite associated with Orthopyroxene Subgroup on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DD.05Ferro-anthophyllite☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2Orth.
9.DD.05Ferro-gedrite☐{Fe2+2}{Fe2+3Al2}(Al2Si6O22)(OH)2Orth.
9.DD.05Gedrite☐{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2Orth.
9.DD.05Holmquistite☐{Li2}{Mg3Al2}(Si8O22)(OH)2Orth.
9.DD.05Proto-ferro-suenoite☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2Orth.
9.DD.05Sodicanthophyllite{Na}{Mg2}{Mg5}(AlSi7O22)(OH)2Orth.
9.DD.05Sodic-ferro-anthophyllite{Na}{Fe2+2}{Fe2+5}(AlSi7O22)(OH)2Orth.
9.DD.05Sodic-ferrogedrite{Na}{Fe2+2}{Fe2+3Al2}(Al3Si5O22)(OH)2Orth.
9.DD.05Ferro-holmquistite☐{Li2}{Fe2+3Al2}(Si8O22)(OH)2Orth.
9.DD.05Proto-anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m)

Related Minerals - Dana Grouping (8th Ed.)Hide

66.1.2.1Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
66.1.2.5Gedrite☐{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2Orth.
66.1.2.9Holmquistite☐{Li2}{Mg3Al2}(Si8O22)(OH)2Orth.

Other InformationHide

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 SodicgedriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hawthorne F.C. (1983) The crystal chemistry of the amphiboles. The Canadian Mineralogist: 21: 173-480.
Mandarino, J.A. (1998) The Second List of Additions and Corrections to the Glossary of Mineral Species (1995). The Amphibole Group. Mineralogical Record: 29: 169-174.
Hawthorne, F.C., Oberti, R. (2006) On the classification of amphiboles. The 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.
Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031-2048.

Internet Links for SodicgedriteHide

Localities for SodicgedriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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