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Ferro-anthophyllite

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Formula:
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
The anthophyllite group are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup. The minerals in this root name group may have either Pnma or Pnmn (proto- prefixed name) space group symmetry. The anthophyllite group's composition is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.

Ferro-anthophyllite has a standard Pnma space group symmetry and is defined with Fe as the dominant element both in the B and C positions.
System:OrthorhombicColour:Clove-brown to dark ...
Lustre:VitreousHardness:5½ - 6
Member of:Anthophyllite Group > Magnesium-iron-manganese Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup
Name:For its relationship to anthophyllite
This page provides mineralogical data about Ferro-anthophyllite.

Classification of Ferro-anthophyllite

IMA status:Approved
Strunz 8th edition ID:8/F.12-70
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.:14.19.4

14 : Silicates not Containing Aluminum
19 : Silicates of Fe
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Type Occurrence of Ferro-anthophyllite

Type Locality:Tamarack and Custer Mine (Thomas; Custer; Murphy; Watson; Nelson; Monroe), Custer Peak, Ninemile Creek, Coeur d'Alene District, Shoshone Co., Idaho, USA

Physical Properties of Ferro-anthophyllite

Lustre:Vitreous
Colour:Clove-brown to dark brown, grey to white, pale green.
Streak:White to greyish-white.
Hardness (Mohs):5½ - 6

Crystallography of Ferro-anthophyllite

Crystal System:Orthorhombic

Chemical Properties of Ferro-anthophyllite

Formula:
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2


The anthophyllite group are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup. The minerals in this root name group may have either Pnma or Pnmn (proto- prefixed name) space group symmetry. The anthophyllite group's composition is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.

Ferro-anthophyllite has a standard Pnma space group symmetry and is defined with Fe as the dominant element both in the B and C positions.
Essential elements:Fe, H, O, Si
All elements listed in formula:Fe, H, O, Si

Relationship of Ferro-anthophyllite to other Species

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

- +
Anthophyllite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
Proto-anthophyllite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
Proto-ferro-anthophyllite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Proto-mangano-ferro-anthophyllite
☐{Mn
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
9.DD.05Ferro-gedrite
☐{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
2
Si
 
6
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:

- +
14.19.1Fayalite
Fe
2+
2
SiO
 
4
14.19.2Ferrosilite
FeSiO
 
3
14.19.3Laihunite
Fe
2+
 
Fe
3+
2
(SiO
 
4
)
 
2
14.19.5Ferripyrophyllite
Fe
3+
2
(Si
 
4
O
 
10
)(OH)
 
2
14.19.6Greenalite
Fe
 
2-3
(Si
 
2
O
 
5
)(OH)
 
4
14.19.7Cronstedtite
Fe
2+
2
Fe
3+
 
((Si,Fe
3+
 
)
 
2
O
 
5
)(OH)
 
4
14.19.8Hisingerite
Fe
3+
2
(Si
 
2
O
 
5
)(OH)
 
4
 · 2H
 
2
O

Other Names for Ferro-anthophyllite

Synonyms:
FeranthophylliteFerro-anthophyllite (of Winchell)
Other Languages:
German:Feranthophyllit
Russian:Ферроантофиллит
Simplified Chinese:铁直闪石
Spanish:Feranthophyllita
Varieties:
Aluminian Ferroanthophyllite

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-anthophyllite

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

Best Localities for Ferro-anthophyllite

Best of Species:Ferro-anthophyllite

Internet Links for Ferro-anthophyllite

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  • Raman and XRD data at RRUFF project
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    • Localities for Ferro-anthophyllite

    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.
    China
     
    • Inner Mongolia Autonomous Region
      • Xilin Gol League (Xilinguole Prefecture)
        • Plain Blue Banner (Zhenglan Co.)
    		Yiming Zhao, Daxin Li, Wenming Chen, Chengyou Feng, and Wenhong Sun (2006): Mineral Deposits 25(2), 113-122
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • Vysočina Region
        • Žďár nad Sázavou
    		Staněk, J.: Parageneze minerálů pegmatitových žil z Hatí u Dolních Borů na západní Moravě. Acta Mus. Moraviae, Sci. nat., vol. 76, pages 19-49. 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.
    Romania
     
    • Suceava Co.
      • Suceava district
        • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
    		http://minerals-of-the-carpathians.eu
    USA
     
    • Idaho
      • Shoshone Co.
        • Coeur d'Alene District
          • Ninemile Creek
            • Custer Peak
    		Rocks & Min. 70:262
    • Massachusetts
      • Essex Co.
    		Gleba, 1978. Massachusetts Mineral & Fossil Localities
    www.agu.org/cgi-bin/wais?l=V21B-01; Bozhilov, K. N. & Evans, B. W., 2001. Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy study.(AmMin 86(10):1252-1260.)
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    Copyright © Jolyon Ralph and Ida Chau 1993-2013. 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.
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