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Protoferro-anthophyllite

Formula:
☐[Fe
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
System:OrthorhombicColour:Grey to brownish-grey.
Lustre:Vitreous
Name:For its structural relationship to ortho-amphiboles, and its relationship to anthophyllite


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

Classification of Protoferro-anthophyllite

IMA status:Approved
Strunz 8th edition ID:8/F.12-150
Nickel-Strunz 10th (pending) edition ID:9.DD.05

9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles
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Type Occurrence of Protoferro-anthophyllite

Co-type Localities:Hirukawa, Ena-gun, Gifu Prefecture, Chubu Region, Honshu Island, Japan
Cheyenne Mt area, El Paso Co., Colorado, USA
Year of Discovery:1986

Physical Properties of Protoferro-anthophyllite

Lustre:Vitreous
Colour:Grey to brownish-grey.
Streak:White to greyish-white.

Crystallography of Protoferro-anthophyllite

Crystal System:Orthorhombic
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 Protoferro-anthophyllite

Type:Biaxial (-)
RI values: nα = 1.690 nβ = 1.710 nγ = 1.726
Maximum Birefringence:δ = 0.036

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:weak to moderate

Chemical Properties of Protoferro-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 Protoferro-anthophyllite to other Species

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.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.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
]

Other Names for Protoferro-anthophyllite

Synonyms:
IMA1986-006
Russian names:
Протоферроантофиллит

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 Protoferro-anthophyllite

Reference List:Physics and Chemistry of Minerals: 25: 366-377.

American Mineralogist (1999): 84: 196.

Sueno, S., Matsuura, S., Bunno, M., and Kurosawa, M. (2002) Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferroanthophyllite from Cheyenne Canyon and Cheyenne Mountain, U.S.A. and Hirukawa-mura, Suisho-yama, and Yokone-yama, Japan. Journal of Mineralogical and Petrological Sciences: 97: 127-136.

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

Internet Links for Protoferro-anthophyllite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    Localities for Protoferro-anthophyllite

    (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.
    Japan
     
    • Honshu Island
      • Chubu Region
        • Gifu Prefecture
          • Ena-gun
    		Phys.Chem.Min. (1998): 25: 366-377; Min.Rec.: 32: 418; Journal of Mineralogical and Petrological Sciences: 97: 127-136.
    USA
     
    • Colorado
      • El Paso Co.
    		Am.Min.: 84: 196; Journal of Mineralogical and Petrological Sciences: 97: 127-136.
    Mineral and/or Locality
    Google
     
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