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Gedrite

Big Photo

Schisshyttan, Västra Silvberg, Ludvika, Dalarna, Sweden
© Jorge M. Alves

Show Gedrite Photos (7)
Formula:
☐[Mg
 
2
][Mg
 
3
Al
 
2
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
System:OrthorhombicColour:Pale greenish-grey to ...
Lustre:VitreousHardness:5½ - 6
Name:For the locality at Héas, Gedres, France


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

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: Peaks:
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
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
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 Ferrogedrite (see here)
Related Minerals - Nickel-Strunz Grouping):
9.DD.05Anthophyllite
☐[Mg
 
2
][Mg
 
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Ferro-anthophyllite
☐[Fe
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Ferrogedrite
☐[Fe
2+
2
][Fe
2+
3
Al
 
2
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
9.DD.05Holmquistite
☐[Li
 
2
][Mg
 
3
Al
 
2
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Protoferro-anthophyllite
☐[Fe
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Protomangano-ferro-anthophyllite
☐[Mn
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Sodicanthophyllite
[Na][NaMg][Mg
 
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Sodic-ferro-anthophyllite
[Na][NaFe
2+
 
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Sodic-ferrogedrite
[Na][Fe
2+
2
][Fe
2+
4
Al][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
9.DD.05Sodicgedrite
[Na][Mg
 
2
][Mg
 
4
Al][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
9.DD.05Ferroholmquistite
☐[Li
 
2
][Fe
2+
3
Al
 
2
][(OH)
 
2
|Si
 
8
O
 
22
]
9.DD.05Protoanthophyllite
☐[Mg
 
2
][Mg
 
5
][(OH)
 
2
|Si
 
8
O
 
22
]
Related Minerals - Hey's Index Grouping:
16.19.1Indialite
Mg
 
2
Al
 
4
Si
 
5
O
 
18
16.19.2Cordierite
(Mg,Fe)
 
2
Al
 
4
Si
 
5
O
 
18
16.19.3Sekaninaite
(Fe,Mg)
 
2
Al
 
4
Si
 
5
O
 
18
16.19.4Ferrogedrite
☐[Fe
2+
2
][Fe
2+
3
Al
 
2
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
16.19.5Staurolite
(Fe
2+
 
,Mg,Zn)
 
1.5-2
Al
 
9
[O
 
6
|(OH,O)
 
2
|(SiO
 
4
)
 
4
]
16.19.6Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
[O|(OH)
 
2
|SiO
 
4
]
16.19.7Amesite
Mg
 
2
Al[(OH)
 
4
|AlSiO
 
5
]
16.19.8Corundophilite
(Mg,Fe,Al)
 
6
(Si,Al)
 
4
O
 
10
(OH)
 
8
16.19.9Yoderite
Mg(Al,Fe
3+
 
)
 
3
[O|OH|(SiO
 
4
)
 
2
]
16.19.10Delessite
(Mg,Fe,Fe,Al)(Si,Al)
 
4
O
 
10
(O,OH)
 
8
16.19.11Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
[(OH)
 
4
|Si
 
2
O
 
6
]
16.19.12Magnesiocarpholite
(Mg,Fe
2+
 
)Al
 
2
[(OH)
 
4
|Si
 
2
O
 
6
]
16.19.13Chamosite
(Fe
2+
 
,Mg)
 
5
Al[(OH)
 
8
|AlSi
 
3
O
 
10
]
16.19.14Orthochamosite
(Fe,Mg,Fe)
 
5
Al(Si
 
3
Al)O
 
10
(OH,O)
 
8
16.19.15Berthierine
(Fe,Fe,Mg)
 
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[(OH)
 
8
|AlSi
 
3
O
 
10
]
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
[(OH)
 
8
|AlSi
 
3
O
 
10
]
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:
BidalotiteMagnesiogedrite
German names:
BidalotitGedritMagnesiogedrit
Russian names:
Жедрит
Spanish names:
BidalotitaGedritaMagnesiogedrita
Varieties:
Snarumite

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.

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

Internet Links for Gedrite

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  • Look for Gedrite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Gedrite in the Natural History Museum (London) online catalogue
  • Gedrite details from Handbook of Mineralogy (PDF)
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    Localities for Gedrite

    Hide Locality List
    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.
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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.
    Algeria
     
    • Tamanghasset Province
      • Ahaggar Mts (Hoggar Mts)
    		C. Lemanski, Jr. (re-entry lost Mindat data).
    Australia
     
    • 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
      • Youanmi
    		Lead, Zinc and Silver Deposits of Western Australia, 1999
    Canada
     
    • Ontario
      • Thunder Bay District
        • Manitouwadge
    Finland
     
    • Länsi-Suomen Lääni
      • Perniö
    		http://www.gsf.fi/explor/zinc/traskbole.htm
    France
     
    • Auvergne
      • Haute-Loire
        • Blesle
          • 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
        • Brioude - Massiac area
          • Brioude
            • Azérat
    		Bull. Minéral. , 1987, 110, pp. 359-371.
            • 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
            • 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
          • Lavoûte-Chilhac
            • Saint-Cirgues
    		F.H. Forestier : "Les Péridotites Serpentinisées en France", Fascicule 4 Haut- Allier, BRGM, 1964
            • Traignac brook (Roulière brook)
              • Left bank
    		F.H. Forestier : "Les Péridotites Serpentinisées en France, Groupe I, Fascicule IV, Bassin du Haut Allier", BRGM, 1964
              • Right bank
    		F.H. Forestier : "Les Péridotites Serpentinisées en France, Groupe I, Fascicule IV, Bassin du Haut Allier", BRGM, 1964
          • Torsiac
            • Lanau
    		F.H. Forestier : "Les Péridotites Serpentinisées en France, Groupe I, Fascicule IV, Bassin du Haut Allier", 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
    • 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 Mts
        • Bad Harzburg
          • Schmalenberg cliff
    		No reference listed
    No reference listed
    Greenland
     
    • Kitaa (West Greenland) Province
      • Nuuk (Godthåb)
    		No reference listed
    Italy
     
    • Piedmont
      • Cuneo Province
    		[MinRec 27:303]
      • 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
        • Doi
    Norway
     
    • Akershus
      • Nesodden
        • Nesoddtangen
    • Aust-Agder
      • Tvedestrand
        • 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
    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.
    Sri Lanka
     
    • Central Province
    		Journal of Petrology, Volume 40, Issue 8: August 1999
    Sweden
     
    • Dalarna
      • Ludvika
        • Grangärde Parish
        • Grängesberg
        • Saxberget ore field
    No reference listed
      • Rättvik
    		No reference listed
    • Hälsingland
      • Ljusdal
    		No reference listed
    • Södermanland
      • Nyköping
        • Tunaberg
    		No reference listed
    • Värmland
      • Filipstad
    No reference listed
    American Mineralogist (1989) 74 (5-6), 573-585
    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
    No reference listed
    No reference listed
    • Västmanland
      • Ljusnarsberg
        • Kopparberg
    		No reference listed
      • Nora
      • Norberg
    No reference listed
    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.
    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.
        • 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.
    • Georgia
      • Douglas Co.
        • Villa Rica
    		Rocks & Min.: 64:194.
      • Rabun Co.
    • Maine
      • Cumberland Co.
        • Harpswell
    		www.maine.gov/doc/nrimc/mgs/explore/bedrock/b42/harpswell.htm
      • Oxford Co.
    		King & Foord, 1994. Mineralogy of Maine, Vol.1, p.29.
    • Massachusetts
      • Essex Co.
    		Gleba, 1978. Massachusetts Mineral & Fossil Localities
      • Hampshire Co.
    		Emerson, 1917. Geology of Mass. & Rhode Island, p.71-2
    • 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
    • North Carolina
      • Buncombe Co.
    		No reference listed
    Wilson,W.F and McKenzie,B.J,1978,Mineral Collecting Sites in North Carolina,Information Circular 24
    rruff.geo.arizona.edu/doclib/hom/gedrite.pdf
    Self Collected Bruce Osborne
    • Vermont
      • Windsor Co.
    		Rocks & Min. Vol. 71, (1996)
    • Virginia
      • Floyd Co.
        • Floyd
    		Minerals of Virginia 1990 by R. V. Dietrich
    • Wisconsin
      • Jackson Co.
    R&M 73:11-12 pp 378-399 Wisconsin Mineral Locality Index
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
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