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Ferro-anthophyllite

Formula:
☐[Fe
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
System:OrthorhombicColour:Clove-brown to dark ...
Lustre:VitreousHardness:5½ - 6
Name:For its relationship to anthophyllite


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

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
][(OH)
 
2
|Si
 
8
O
 
22
]
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)
Related Minerals - Nickel-Strunz Grouping):

- +
9.DD.05Ferrogedrite
☐[Fe
2+
2
][Fe
2+
3
Al
 
2
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
9.DD.05Gedrite
☐[Mg
 
2
][Mg
 
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:

- +
14.19.1Fayalite
Fe
2+
2
[SiO
 
4
]
14.19.2Ferrosilite
Fe
 
2
[SiO
 
3
]
 
2
14.19.3Laihunite
Fe
2+
 
Fe
3+
2
[SiO
 
4
]
 
2
14.19.5Ferripyrophyllite
Fe
 
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
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.

Internet Links for Ferro-anthophyllite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Ferro-anthophyllite in the Natural History Museum (London) online catalogue
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    Localities for Ferro-anthophyllite

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