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Ferrogedrite

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Big Photo

Dolní Bory, Žďár nad Sázavou, Vysočina Region, Moravia (Mähren; Maehren), Czech Republic
© Jakub Jirásek

Show Ferrogedrite Photos (5)



Formula:
☐{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
System:OrthorhombicColour:Pale greenish-grey to ...
Lustre:VitreousHardness:5½ - 6
Member of:Mg-Fe-Mn-Li Ortho-Amphibole Subgroup > Amphibole Group
Name:For its relationship to gedrite


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

Classification of Ferrogedrite

IMA status:Approved
Strunz 8th edition ID:8/F.12-110
Nickel-Strunz 10th (pending) edition ID:9.DD.05

9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles
Hey's CIM Ref.:16.19.4

16 : Silicates Containing Aluminum and other Metals
19 : Aluminosilicates of Fe and Mg
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Physical Properties of Ferrogedrite

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

Crystallography of Ferrogedrite

Crystal System:Orthorhombic
Cell Parameters:a = 18.52Å, b = 17.94Å, c = 5.31Å
Ratio:a:b:c = 1.032 : 1 : 0.296
Unit Cell Volume:V 1,764.24 ų (Calculated from Unit Cell)

Optical Data of Ferrogedrite

Type:Biaxial (-)
RI values: nα = 1.642 - 1.694 nβ = 1.649 - 1.710 nγ = 1.661 - 1.722
2V:Measured: 82° , Calculated: 76° to 80°
Maximum Birefringence:δ = 0.019 - 0.028

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

Chemical Properties of Ferrogedrite

Formula:
☐{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
Essential elements:Al, Fe, H, O, Si
All elements listed in formula:Al, Fe, H, O, Si
Common Impurities:Ti,Mn,Ca,Na,K,F

Relationship of Ferrogedrite to other Species

Series:Forms a series with Gedrite (see here)
Member of:Mg-Fe-Mn-Li Ortho-Amphibole Subgroup > Amphibole Group
Other Members of Group:

- +
Anthophyllite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
Ferro-anthophyllite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Gedrite
☐{Mg
 
2
}{Mg
 
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
Holmquistite
☐{Li
 
2
}{Mg
 
3
Al
 
2
}(Si
 
8
O
 
22
)(OH)
 
2
Protoferro-anthophyllite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Protomangano-ferro-anthophyllite
☐{Mn
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Sodic-ferro-anthophyllite
{Na}{NaFe
2+
 
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Sodic-ferrogedrite
{Na}{Fe
2+
2
}{Fe
2+
4
Al}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
Sodicanthophyllite
{Na}{NaMg}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
Sodicgedrite
{Na}{Mg
 
2
}{Mg
 
4
Al}(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.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.05Protoferro-anthophyllite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Protomangano-ferro-anthophyllite
☐{Mn
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Sodicanthophyllite
{Na}{NaMg}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Sodic-ferro-anthophyllite
{Na}{NaFe
2+
 
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Sodic-ferrogedrite
{Na}{Fe
2+
2
}{Fe
2+
4
Al}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
9.DD.05Sodicgedrite
{Na}{Mg
 
2
}{Mg
 
4
Al}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
9.DD.05Ferroholmquistite
☐{Li
 
2
}{Fe
2+
3
Al
 
2
}(Si
 
8
O
 
22
)(OH)
 
2
9.DD.05Protoanthophyllite
☐{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
)
16.19.5Staurolite
(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,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(AlSi
 
3
O
 
10
)(OH)
 
8
16.19.18Gedrite
☐{Mg
 
2
}{Mg
 
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
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 Ferrogedrite

Other Languages:
German:Ferrogedrit
Spanish:Ferrogedrita

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 Ferrogedrite

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 Ferrogedrite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Ferrogedrite details from Handbook of Mineralogy (PDF)
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    • Localities for Ferrogedrite

    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.
    Hide Locality List
    (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.
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • Vysočina Region
        • Žďár nad Sázavou
    		Schreyer, W., Bernhardt, H.-J., Medenbach, O.: Ferrogedrite, siderophyllite, septechamosite, andalusite and chloritoid as alteration products of sekaninaite (ferrocordierite) from the Dolní Bory pegmatite, Moravia. Russian Geology and Geophysics, 1993, 34, 12, 125-131.
    Finland
     
    • Etelä-Suomen Lääni
      • Orivesi
    		Probed
    Germany
     
    • Schleswig-Holstein
      • Brunsbüttel
    		A. Wittern: "Mineralfundorte in Deutschland", Schweizerbart (Stuttgart), 2001
      • Elmshorn
        • Barmstedt
    		A. Wittern: "Mineralfundorte in Deutschland", Schweizerbart (Stuttgart), 2001
    Greenland
     
    • Kitaa (West Greenland) Province
      • Nuuk (Godthåb)
    		Petersen, O. V. & Secher, K. (1993): The Minerals of Greenland. Mineralogical Record 24 (2): 1-67
    India
     
    • Rajasthan (Rajputana)
      • Jaipur Division
        • Jhunjhunu District
    		Min. Mag. (1967) 36 ,22-28
    Japan
     
    • Honshu Island
      • Chubu Region
        • Gifu Prefecture
          • Ena City
      • Tohoku Region
        • Iwate Prefecture
          • Tono City
            • Miyamori
    		Seki, Y., and Yamasaki, M. (1957): American Mineralogist 42, 506-520.
    USA
     
    • New Hampshire
      • Carroll Co.
        • Hale's Location
    		Smith, Arthur E. (2005): New Hampshire Mineral Locality Index (Rocks & Minerals 80:242-261)
    • New York
    		John H. Betts (2009) "The minerals of New York City", Rocks & Minerals, 84, 204-240.
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 18th Jun 2011 21:11:22
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