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Ferro-gedrite

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Big Photo

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

Show Ferro-gedrite Photos (5)



Formula:
☐{Fe
2+
2
}{Fe
2+
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

Ferro-gedrite is defined with Fe2+ as the dominant element 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 Group > Magnesium-iron-manganese Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Name:For its relationship to gedrite
This page provides mineralogical data about Ferro-gedrite.

Classification of Ferro-gedrite

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 Ferro-gedrite

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

Crystallography of Ferro-gedrite

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 Ferro-gedrite

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 Ferro-gedrite

Formula:
☐{Fe
2+
2
}{Fe
2+
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

Ferro-gedrite is defined with Fe2+ as the dominant element both in the B and C2+ positions and Al in the C3+ position.
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 Ferro-gedrite to other Species

Member of:Gedrite Group > Magnesium-iron-manganese Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Other Members of Group:

- +
Gedrite
☐{Mg
 
2
}{Mg
 
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.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.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
)
16.19.5Staurolite
(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
16.19.18Gedrite
☐{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 Ferro-gedrite

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 Ferro-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.

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 Ferro-gedrite

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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 Ferro-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.
    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
     
    • Western and Inner Finland Region
      • 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
    		Excalibur Mineral Co. specimens; RRUFF Project Specimen ID: R060330
      • 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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