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Gedrite

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Formula:
☐{Mg
 
2
}{Mg
 
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
The gedrite group are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)>1 apfu

Gedrite is defined with Mg2+ as the dominant cation both in the B and C2+ positions and Al in the C3+ position.
System:OrthorhombicColour:Pale greenish-grey to ...
Lustre:VitreousHardness:5½ - 6
Member of:Gedrite Root Name Group > Magnesium-iron-manganese Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Name:Named after the type locality at Gèdres, Héas Valley, France


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Classification of Gedrite

IMA status:Approved
Strunz 8th edition ID:8/F.12-100
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:66.1.2.5

66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
1 : Amphiboles - Mg-Fe-Mn-Li subgroup
Hey's CIM Ref.:16.19.18

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

Type Locality:Gèdres, Héas valley, Luz-Saint-Sauveur, Hautes-Pyrénées, Midi-Pyrénées, France
Year of Discovery:1836

Physical Properties of Gedrite

Lustre:Vitreous
Colour:Pale greenish-grey to brown
Streak:White
Hardness (Mohs):5½ - 6

Crystallography of Gedrite

Crystal System:Orthorhombic
Cell Parameters:a = 18.59Å, b = 17.89Å, c = 5.3Å
Ratio:a:b:c = 1.039 : 1 : 0.296
Unit Cell Volume:V 1,762.65 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Gedrite

Type:Biaxial (-)
RI values: nα = 1.671 nβ = 1.681 nγ = 1.690
2V:Measured: 75° , Calculated: 86°
Maximum Birefringence:δ = 0.019

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

Chemical Properties of Gedrite

Formula:
☐{Mg
 
2
}{Mg
 
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2


The gedrite group are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)>1 apfu

Gedrite is defined with Mg2+ as the dominant cation both in the B and C2+ positions and Al in the C3+ position.
Simplified for copy/paste:☐{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2
Essential elements:Al, H, Mg, O, Si
All elements listed in formula:Al, H, Mg, O, Si
Common Impurities:Mn,Ca,Ti,Na,K

Relationship of Gedrite to other Species

Series:Forms a series with Anthophyllite (see here)
Member of:Gedrite Root Name Group > Magnesium-iron-manganese Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Other Members of Group:

- +
Ferro-gedrite
☐{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
2
Si
 
6
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.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.05Sodicgedrite
{Na}{Mg
 
2
}{Mg
 
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
Related Minerals - Hey's Index Grouping:

- +
16.19.1Indialite
Mg
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
16.19.2Cordierite
(Mg,Fe)
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
16.19.3Sekaninaite
(Fe,Mg)
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
16.19.4Ferro-gedrite
☐{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.19.5Staurolite
(Fe
2+
 
,Mg,Zn)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH,O)
 
2
16.19.6Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
(SiO
 
4
)O(OH)
 
2
16.19.7Amesite
Mg
 
2
Al(AlSiO
 
5
)(OH)
 
4
16.19.8Corundophilite
(Mg,Fe,Al)
 
6
(Si,Al)
 
4
O
 
10
(OH)
 
8
16.19.9Yoderite
Mg(Al,Fe
3+
 
)
 
3
(SiO
 
4
)
 
2
O(OH)
16.19.10Delessite
(Mg,Fe,Fe,Al)(Si,Al)
 
4
O
 
10
(O,OH)
 
8
16.19.11Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
16.19.12Magnesiocarpholite
(Mg,Fe
2+
 
)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
16.19.13Chamosite
(Fe
2+
 
,Mg)
 
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
16.19.14Orthochamosite
(Fe
2+
 
,Mg,Fe
3+
 
)
 
5
Al(AlSi
 
3
O
 
10
)(OH,O)
 
8
16.19.15Berthierine
(Fe
2+
 
,Fe
3+
 
,AlMg)
 
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(AlSi
 
3
O
 
10
)(OH)
 
8
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
(AlSi
 
3
O
 
10
)(OH)
 
8
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 Gedrite

Synonyms:
Magnesiogedrite
Other Languages:
German:Bidalotit
Gedrit
Magnesiogedrit
Russian:Жедрит
Simplified Chinese:铝直闪石
Spanish:Bidalotita
Gedrita
Magnesiogedrita
Varieties:
BidalotiteSnarumite

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 Gedrite

Reference List:

- +
Mineralogical Record: 29: 169-174.

P. E. Champness and K. A. Rodgers (2000) The origin of iridescence in anthophyllite-gedrite from Simiuttat, Nuuk district, southern West Greenland. Mineralogical Magazine 64, 885-889.

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

Schindler, M.; Sokolova, E.; Abdu, Y.; Hawthorne, F.C.; Evans, B.W.; Ishida, K. (2008) The crystal chemistry of the gedrite-group amphiboles. I. Crystal structure and site populations. Mineral. Mag., 72, 703-730.

Hawthorne, F.C.; Schindler, M.; Abdu, Y.; Sokolova, E.; Evans, B.W.; Ishida, K. (2008) The crystal chemistry of the gedrite-group amphiboles. II. Stereochemistry and chemical relations. Mineral. Mag., 72, 731-745.

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 Gedrite

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  • Localities for Gedrite

    The 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.
    (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.
    Afghanistan
     
    • Badakhshan Province (Badakshan Province; Badahsan Province)
      • Khash & Kuran Wa Munjan Districts
        • Koksha Valley (Kokscha Valley; Kokcha Valley)
          • Sar-e Sang (Sar Sang; Sary Sang)
            • Ladjuar Medam (Lajur Madan; Lapis-lazuli Mine; Lapis-lazuli deposit)
    Deer, Howie and Zussman (1978) Rock-forming Minerals, Vol. 2A, Single-Chain Silicates. (2nd ed.)
    Algeria
     
    • Tamanghasset Province
      • Ahaggar Mtn (Hoggar Mtn)
    C. Lemanski, Jr. (re-entry lost Mindat data).
    Australia
     
    • New South Wales
      • Georgiana Co.
    Sheppard, S., Walshe, J. L., & Pooley, G. D. (1995). Noncarbonate, skarnlike Au-Bi-Te mineralization, Lucky Draw, New South Wales, Australia. Economic Geology, 90(6), 1553-1569.
      • Yancowinna Co.
        • Broken Hill District
          • Northern Section
    Econ Geol (1993) 88:505-541
    • Northern Territory
      • Arunta Region
    Vry, J.K.(1994): Boron-free Kornerupine from the Reynolds Range Arunta Block Central Australia, Mineralogical Magazine (Mar 1994): 58, 27-37.
      • Central Desert Shire
        • Strangways Range
    Wilson, A. F. (1977). A zincian hogbomite and some other hogbomites from the Strangways Range, Central Australia. Mineralogical Magazine, 41, 337-44.
    • Queensland
      • Mount Isa - Cloncurry area
        • Cloncurry District
          • Roxmere Station
    2002. Rubenach, M. J. & Lewthwaite. Metasomatic albitites and related biotite rich schists from a low pressure polymetamorphic terrane, Snake Creek Anticline, Mount Isa Inlier, north-eastern Australia: microstructures and P-T-d paths. Journal of Metamorphic Geology, 20, 191-202
    • Tasmania
      • Huon district
        • Weld river
    Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
      • Rosebery district
    Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
    • Western Australia
      • Sandstone Shire
        • Youanmi
    Lead, Zinc and Silver Deposits of Western Australia, 1999
    Botswana
     
    • North-East District
      • Francistown District
        • Selebi-Phikwe belt (Selbi-Pikwe)
    Maier, W.D., Barnes, S.-J., Chinyepi, G., Barton, Jr., J.M., Eglington, B., and Setshedi, I. (2008): Mineralium Deposita 43, 37-60.
    Brazil
     
    • Goiás
      • Sanclerlândia
    Candia, M.A.F., and Gaspar, J.C. (1997): Mineralogy and Petrology 60, 27-40.
      • Uruaçu
    Econ Geol (1986) 81:1884-1898; Kuyumjian, R. M. (2008). Magmatic arc and associated gold, copper, silver, and barite deposits in the state of Goiás, central Brazil: characteristics and speculations. Brazilian Journal of Geology, 30(2).
    Canada
     
    • Manitoba
    Bernier, Louis R., 1990, Vanadiferous Zincian-Chromian Hercynite in a Metamorphosed Basalt-Hosted Alteration Zone, Atik Lake, Manitoba, Canadian Mineralogist (1990) v. 28:57-50.
      • Snow Lake District
    Calvert C. Bristol and Edgar Froese (1989) Highly metamorphosed altered rocks associated with the Osborne Lake volcanogenic massive sulfide deposit, Snow Lake area, Manitoba Can Mineral, 27:593-600
    • Ontario
      • Kenora District
        • Balmer Township
    Charles A. Tarnocai, Keiko Hattori, and Louis J. Cabri (1997) "Invisible" gold in sulfides from Campbell Mine, Red lake greenstone belt, Ontario; evidence for mineralization during the peak of metamorphism. Can Mineral 35:805-815
      • Thunder Bay District
        • Gemmell Township
    Contributions to Mineralogy and Petrology Volume 101, Number 3 / March, 1989 Pages 350-360; Franklin, J M, Schnieders, B R, Koopman, E R (1991) Mineral Deposits in the western Superior Province, Ontario (Field Trip 9) Geological Survey of Canada, Open File 2164; Economic Geology April 1986 v. 81 no. 2 p. 323-342
    Can Mineral February 1997 v. 35 no. 1 p. 105-118
    • Québec
      • Outaouais
        • Pontiac RCM
    Econ Geol. (1990) 85:164-171
    China
     
    • Hebei Province
      • Baoding Prefecture
        • Fuping Co.
    Guochun Zhao, Min Sun, Wilde, S.A., and Jinghui Guo (2004), In: Malpas, J., Fletcher, C.J.N., Ali, J.R., and Aitchison, J.C. (eds.): Aspects of the Tectonic Evolution of China. Geological Society, London, Special Publications 226, pp. 27-55
    • Inner Mongolia Autonomous Region
      • Xilin Gol League (Xilinguole Prefecture)
        • Plain Blue Banner (Zhenglan Co.)
    Yiming Zhao, Daxin Li, Liangshi Wu, Wenming Chen, Chengyou Feng, Peihua Wang, and Xuedong Gao (2008): Mineral Deposits 27(4), 425-448
    • Shanxi Province
      • Xinzhou Prefecture
        • Dai Co.
          • Yanmenguan
    Songnian Lu, Huaikun Li, and Yongqing Tian (2003): Geological Survey and Research 26(1), 15-20
    Finland
     
    • Eastern Finland Region
    Grew, E.S., Pertsev, N.N., Vrána, S., Yates, M.G., Shearer, C.K., and Wiedenbeck, M. (1998): Contributions to Mineralogy and Petrology 131, 22-38.
    • Southwestern Finland Region
      • Salo
        • Perniö
    http://www.gsf.fi/explor/zinc/traskbole.htm
    Niskanen, Maria (2014). Salitun felsisten juonten mineraalikoostumus ja evoluutio. Pro Gradu-tutkielma (2014). Geotieteiden ja Maantieteen Laitos Helsingin Yliopisto.gedrite
    France
     
    • Auvergne
      • Haute-Loire
        • Auzon
          • Azérat
    Bull. Minéral. , 1987, 110, pp. 359-371.
        • Brioude
          • Paulhac
    P.G. Pélisson : "Etude Minéralogique et Métallogénique du District Filonien Polytype de Paulhaguet (Haute-Loire, Massif Central Français)", Doctorate Thesis, Orléans, France, 1989 ; F.H. Forestier : "Les Péridotites Serpentinisées en France", Fascicule IV, BRGM, 1964
          • Vieille-Brioude
    P.G. Pélisson : "Etude Minéralogique et Métallogénique du District Filonien Polytype de Paulhaguet (Haute-Loire, Massif Central Français)", Doctorate Thesis, Orléans, France, 1989
        • Lavoûte-Chilhac
          • Saint-Cirgues
    F.H. Forestier : "Les Péridotites Serpentinisées en France", Fascicule 4 Haut- Allier, BRGM, 1964
    F.H. Forestier : "Les Péridotites Serpentinisées en France, Groupe I, Fascicule IV, Bassin du Haut Allier", BRGM, 1964
          • Villeneuve d'Allier
    F.H. Forestier : "Les Péridotites Serpentinisées en France, Groupe I, Fascicule IV, Bassin du Haut Allier", BRGM, 1964
    F.H. Forestier : "Les Péridotites Serpentinisées en France, Groupe I, Fascicule IV, Bassin du Haut Allier", BRGM, 1964
    F.H. Forestier : "Les Péridotites Serpentinisées en France, Groupe I, Fascicule IV, Bassin du Haut Allier", BRGM, 1964
        • Lubilhac
    P.G. Pélisson : "Etude Minéralogique et Métallogénique du District Filonien Polytype de Paulhaguet (Haute-Loire, Massif Central Français)", Doctorate Thesis, Orléans, France, 1989 ; F.H. Forestier : "Les Péridotites Serpentinisées de France", Fascicule IV, BRGM, 1964
        • Paulhaguet
          • Salzuit
        • Pinols
          • Desges
    P.G. Pélisson : "Etude Minéralogique et Métallogénique du District Filonien Polytype de Paulhaguet (Haute-Loire, Massif Central Français)", Doctorate Thesis, Orléans, France, 1989
        • Saugues
          • Venteuges
            • La Bastide
    P.G. Pélisson : "Etude Minéralogique et Métallogénique du District Filonien Polytype de Paulhaguet (Haute-Loire, Massif Central Français)", Doctorate Thesis, Orléans, France, 1989
        • Torsiac
          • Lanau
    F.H. Forestier : "Les Péridotites Serpentinisées en France, Groupe I, Fascicule IV, Bassin du Haut Allier", BRGM, 1964
    • Midi-Pyrénées
      • Aveyron
        • Decazeville
          • Almont-les-Junies
    R. Pierrot, R. Pulou, P. Picot : "Inventaire Minéralogique de la France N° 7 : Aveyron", BRGM, 1977
      • Hautes-Pyrénées
        • Luz-Saint-Sauveur
          • Héas valley
    AM 63 (1978), 1023
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Elz valley
    K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
    • Lower Saxony
      • Harz
        • Bad Harzburg
          • Schmalenberg cliff
    No reference listed
    No reference listed
    Greenland
     
    • Sermersooq
      • Nuuk (Godthåb)
    Petersen, O. V. & Secher, K. (1993): The Minerals of Greenland. Mineralogical Record 24 (2): 1-67
          • Bjørnesund
    Friend, C,R.L. (1982): A1-Cr substitution in peraluminous sapphirines
    Boeggild, O.B. (1953): The Mineralogy of Greenland, Reitzels Forlag Koebenhavn; Mineralogical Magazine 1987 51 : 695-708.
    Ackermand, D., Windley, B.F., Herd R.K. (1983): Magnesian Högbomite in a Sapphirine-bearing rock from the Fiskenaesset region, W. Greenland, Mineralogical Magazine, Vol. 47, 555-561
    Peter W. Uitterdijk Appel (1986) Gahnite in an Archaean Iron-Formation, West Greenland. Mineralogical Magazine 50:175-177.
    Mineralogical Magazine 1996 60 : 937-947; P. E. Champness and K. A. Rodgers (2000): The origin of iridescence in anthophyllite-gedrite from Simiuttat, Nuuk district, southern West Greenland. Mineralogical Magazine 64, 885-889.
    India
     
    • Karnataka
      • Tumkur District
        • Koratagere Taluk
    [var: Bidalotite] B. Rama Rao and L. Rama Rao (1937) Proceedings: Plant Sciences, 5, #6.
    Italy
     
    • Piedmont
      • Cuneo Province
    [MinRec 27:303]
        • Varaita Valley
          • Brossasco
    Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
      • Torino Province
        • Canavese District
          • Léssolo
            • Cálea
    Le miniere di Brosso (2001)-Italo Campostrini- ed. Museo Regionale Torino
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Tottori Prefecture
          • Hino-gun
            • Nichinan-cho
    Alfredo Petrov - unpublished
    • Shikoku Island
      • Ehime Prefecture
        • Shikokuchuo City
          • Doi
    Madagascar
     
    • Antananarivo Province
      • Vakinankaratra Region
    Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
    New Zealand
     
    • South Island
      • Southland
        • Fiordland
    C. M. Ward (1984) Magnesium staurolite and green chromian staurolite from Fiordland, New Zealand . American Mineralogist, Volume 69, pages 531-540.
    Norway
     
    • Akershus
      • Nesodden
        • Nesoddtangen
    • Aust-Agder
      • Froland
    D.Visser; The metamorphic evolution of the bamble sector, south Norway, Geologica Ultraiectina No.103, University of Utrecht, Netherlands. 1993
      • Risør
        • Søndeled
    Kihle, J.B. (2013): World's greatest cordierite find? Norsk Bergverksmuseum Skrifter. 50, 59-62
      • Tvedestrand
    Kihle, 1989: Polymetamorphic Evolution of the Cordierite-bearing metapelites of Bamble-sector, SE Norway. Thesis, Univ. Oslo
        • Snaresund
    Touret, J. & De La Roche, H. (1971): Contribution to the mineralogy of Norway , No. 45. Saphirine à Snaresund, prés de Tvedestrand (Norvége Méridionale). Norsk Geologisk Tidsskrift 51, 170-175
    • Buskerud
      • Modum
        • Skuterud Mines (Skutterud Mines; Modum Cobalt Mines)
    Norges geologiske undersøkelse.Malmdatabasen. Skuterud Mellomgruver. Forekomst nr.21 i Modum (0623) kommune
    • Nordland
      • Hemnes
        • Bleikvassli
    Rosenberg, J.L., Spry, P.G., Jacobson, C.E., and Vokes, F.M. (2000): The effects of sulfidation and oxidation during metamorphism on compositionally varied rocks adjacent to the Bleikvassli Zn-Pb-(Cu) deposit, Nordland, Norway. Mineralium Deposita 35, 714-726.
    • Telemark
    Van King
    Wilke, H.-J. (1976): Mineral-Fundstellen Band 4: Skandinavien. Chr. Weise Verlag, München, p. 73-74
    Russia
     
    • Far-Eastern Region
      • Magadanskaya Oblast'
        • Kolyma River Basin
          • Ducat District
            • Omsukchan
    Filimonova, L.G., and Trubkin, N.V. (2008): Geology of Ore Deposits 50(2), 135-144.
    • Northern Region
      • Karelia Republic
        • Northern Karelia
    Nikolay Serebryakov data
          • Loukhi
            • Tedino
              • Dyadino lake
    P.M. Kartashov data
    - Yu.A.Kozhevnikov (2010) Samotsvetnye tropy,Moscow,Mir Samotcvetov, 56p (in Rus.)
    • Urals Region
      • Middle Urals
        • Sverdlovskaya Oblast'
    Gregor Borg et al (2001) Deep Exhumation and Tectonic Emplacement of the Nishni Tagil Ultramafic Complex and its Platinum Ores, Urals, Russia in (2001) European Union of Geosciences Conference XI (OS6)
    South Africa
     
    • Northern Cape Province
      • Namakwa District (Namaqualand)
    Contrib Mineral Petrol (1985) 91 : 369 382
    Contrib Mineral Petrol (1985) 91 : 369 382
    Spain
     
    • Catalonia
      • Girona (Gerona)
        • Alt Empordà
          • Cadaqués
    Bareche, E. (2005) "Els minerals de Catalunya. Segle XX" Ed. Museu Mollfulleda de Mineralogia - Grup Mineralògic Català, 269 p.
    • Galicia
      • A Coruña (La Coruña)
        • Santiago de Compostela
          • Aríns
    Pascual, E; Estévez, A. (1981) Estudio geológico del yacimiento de Fornás (Santiago). Cuaderno do Laboratorio Xeolóxico de Laxe 2 (vol II):191-211; ATLANTI, C., & BISCAY, B. (1983). The mineralogy and metamorphism of some gahnite-bearing silicate inclusions in massive sulphides from Fornas, north-west Spain. Mineralogical Magazine, 47, 233-235.
    Sri Lanka
     
    • Central Province
    Journal of Petrology, Volume 40, Issue 8: August 1999
    Sweden
     
    • Dalarna
      • Falun
    Lasskogen, J. (2010). Volcanological and volcano-sedimentary facies stratigraphical interpretation of the Falun Cu-Zn-Pb-(Ag-Au) sulphide deposit, Bergslagen district, Sweden. MS Thesis
      • Hedemora
        • Garpenberg
    Öhman, L., F. Grensman (2000): Garpenberg (Södra). Litofilen, 17, 29-38
      • Ludvika
        • Grängesberg
        • Saxberget ore field
      • Rättvik
    No reference listed
      • Smedjebacken
    Wilke, H.-J. (1976): Mineral-Fundstellen Band 4: Skandinavien. Chr. Weise Verlag, München, 370 pp. (p.209)
    Michael C. Roarke Photo & specimen (Visually identified ?)
    33 IGC excursion No 12, August 14 – 20, 2008
    • Hälsingland
      • Ljusdal
    No reference listed
    • Värmland
      • Filipstad
    Damman, A.: (1988): Hydrothermal Subsilicic Sodium Gedrite from the Gåsborn Area, West Bergslagen, Central Sweden. Mineralogical Magazine. 52 : 193-200
    Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
        • Nordmark district
    No reference listed
    No reference listed
    No reference listed
        • Persberg district
    • Västmanland
      • Ljusnarsberg
        • Kopparberg
    No reference listed
      • Nora
      • Norberg
    No reference listed
    Switzerland
     
    • Ticino (Tessin)
      • Riviera
    Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 179.
    Tajikistan
     
    • Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni)
      • Pamir Mts
        • Pyandzh River Valley
    Grew, E.S., Pertsev, N.N., Vrána, S., Yates, M.G., Shearer, C.K., and Wiedenbeck, M. (1998): Contributions to Mineralogy and Petrology 131, 22-38.
    UK
     
    • Scotland
      • North West Highlands (Inverness-shire)
        • Drumnadrochit
    BMS Database
    BMS Database
    [Specimen in the Natural History Museum, London]
    USA
     
    • Arizona
      • Santa Cruz Co.
        • Patagonia Mts
          • Patagonia District
    Schrader, F.C. and J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, AZ, USGS Bull. 582: 328.
              • Nash Mines group (Duquesne-Washington group)
    Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 334.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 230; Schrader, F.C. and J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, AZ, USGS Bull. 582; Galbraith, F.W. & Brennan (1959), Minerals of AZ: 91.
    • Colorado
      • Boulder Co.
    Minerals of Colorado (1997) Eckels, E. B.
      • Chaffee Co.
        • Monarch District
    The Canadian Mineralogist Vol. 43, pp. 601-622 (2005)
        • Sedalia District
    ("Minerals of Colorado, updated & revised", by Eckel, Edwin B., 1997)
    Minerals of Colorado (1997) Eckels, E. B.
      • Clear Creek Co.
    Minerals of Colorado (1997) Eckels, E. B.
      • Gilpin Co.
    Minerals of Colorado (1997) Eckels, E. B.
      • Gunnison Co.
    Journal of Petrology (1991) 32:6 Pages 1169-1201
      • Jefferson Co.
    Minerals of Colorado (1997) Eckels, E. B.
        • Morrison Area
    Minerals of Colorado (1997) Eckels, E. B.
    Minerals of Colorado (1997) Eckels, E. B.
    • Connecticut
      • Middlesex Co.
        • Deep River
    Observation by Jeremy Zolan
        • Haddam
    Lundgren, Lawrence, Jr. (1979): THE BEDROCK GEOLOGY OF THE HADDAM QUADRANGLE. State Geological and Natural History Survey of Connecticut. Quadrangle Report No. 37, pages 9-13.
    - Lundgren, Lawrence, Jr. (1979): THE BEDROCK GEOLOGY OF THE HADDAM QUADRANGLE. State Geological and Natural History Survey of Connecticut. Quadrangle Report No. 37
    • Georgia
      • Douglas Co.
        • Villa Rica
    Rocks & Min.: 64:194.
      • Rabun Co.
    American Mineralogist, Volume 72, pages 1086-1096, 1987
    • Idaho
      • Clearwater Co.
        • Orofino District
    Hietanen, Anna, 1959, Kyanite-Garnet Gedritite near Orofino, Idaho, American Mineralogist, 44: 539-564.
    • Maine
      • Cumberland Co.
        • Harpswell
    www.maine.gov/doc/nrimc/mgs/explore/bedrock/b42/harpswell.htm
    www.maine.gov/doc/nrimc/mgs/explore/bedrock/b42/harpswell.htm
      • Oxford Co.
        • Grafton
    King & Foord, 1994. Mineralogy of Maine, Vol.1, p.29.
    • Massachusetts
      • Essex Co.
    Gleba, 1978. Massachusetts Mineral & Fossil Localities
      • Franklin Co.
    Emerson, B. K. (1895): A Mineralogical Lexicon of Franklin, Hampshire, and Hampden Counties, Massachusetts (USGS Bulletin 126).
      • Hampshire Co.
    Emerson, 1917. Geology of Mass. & Rhode Island, p.71-2
    • Montana
      • Beaverhead Co.
        • Ruby Range
    Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240.
    • Nevada
      • Clark Co.
    NBMG Spec. Pub. 31 Minerals of Nevada
    • New Hampshire
    http://kilburn.keene.edu/Research/WestCentralNH/
    Schumacher and Robinson, 1987: Journal of Petrology 28 (6):1033-1073
    Schumacher, J.C. and Robinson, Peter (1987). Mineral chemistry and metasomatic growth of aluminous enclaves in gedrite-cordierite gneiss, southwestern New Hampshire, Journal of Petrology 28:1033-1073
      • Grafton Co.
        • Lisbon
    P Cristofono collection
    • North Carolina
      • Buncombe Co.
    No reference listed
    Wilson,W.F and McKenzie,B.J,1978,Mineral Collecting Sites in North Carolina,Information Circular 24
    J.J Papike and Malcolm Ross,1970,Gedrites:Crystal Structures And Intra-Crystalline Cations Distribution:The American Mineralogist,Vol.55,Nov-Dec,1970
    Self Collected Bruce Osborne
    • Vermont
      • Windsor Co.
    Rocks & Min. Vol. 71, (1996)
          • Mt Cube Quadrangle
    Spear, Frank, 1982. in Journal of Petrology 23(3):383-426
    • Virginia
      • Floyd Co.
        • Floyd
    Minerals of Virginia 1990 by R. V. Dietrich
    • Wisconsin
      • Jackson Co.
    Kimball, Karen, 1979, "Co-existing amphiboles at Black River Falls, Wisconsin", Abst. 25th Annual Institute on Lake Superior Geology, Duluth, U of M-Duluth, p. 22-23.
      • Oconto Co.
    R&M 73:11-12 pp 378-399 Wisconsin Mineral Locality Index
    Zimbabwe
     
    • Mashonaland West
      • Zambezi Belt
    J. Petrology (2002) 43 (2): 271-290.
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