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Ferro-anthophyllite

A valid IMA mineral species - grandfathered
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04952600017271923053600.jpg
Ferro-anthophyllite

Stripåsen Mine, Häste ore field, Norberg, Västmanland County, Sweden
04952600017271923053600.jpg
Ferro-anthophyllite

Stripåsen Mine, Häste ore field, Norberg, Västmanland County, Sweden
04952600017271923053600.jpg
Ferro-anthophyllite

Stripåsen Mine, Häste ore field, Norberg, Västmanland County, Sweden
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About Ferro-anthophylliteHide

Formula:
◻Fe2+2Fe2+5(Si8O22)(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 general 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.
Colour:
Clove-brown to dark brown, grey to white, pale green.
Lustre:
Vitreous
Hardness:
5½ - 6
Specific Gravity:
3.24
Crystal System:
Orthorhombic
Name:
For its relationship to anthophyllite.
Forms a series with anthophyllite.


Unique IdentifiersHide

Mindat ID:
1464
Long-form identifier:
mindat:1:1:1464:5

IMA Classification of Ferro-anthophylliteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Redefined by the IMA
IMA Formula:
◻Fe2+2Fe2+5Si8O22(OH)2
First published:
1921
Approval history:
Redefined IMA 2012 s.p.

Classification of Ferro-anthophylliteHide

Strunz-mindat (2026):
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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference for Standard
FathIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
FathWhitney & Evans (2010)Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371

Physical Properties of Ferro-anthophylliteHide

Lustre:
Vitreous
Colour:
Clove-brown to dark brown, grey to white, pale green.
Streak:
White to greyish-white.
Hardness:
5½ - 6 on Mohs scale
Tenacity:
Flexible
Density:
3.24 g/cm3 (Measured)    

Chemistry of Ferro-anthophylliteHide

Mindat Formula:
◻Fe2+2Fe2+5(Si8O22)(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 general 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.
Element Weights:
Element% weight
Fe39.029 %
O38.337 %
Si22.433 %
H0.201 %

Calculated from ideal end-member formula.
Elements listed:
Fe, H, O, Si - search for minerals with similar chemistry

Crystallography of Ferro-anthophylliteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 18.686(7) Å, b = 18.358(20) Å, c = 5.336(2) Å
Ratio:
a:b:c = 1.018 : 1 : 0.291
Unit Cell V:
1,830.45 ų (Calculated from Unit Cell)
Z:
4
Comment:
For synthetic sample with Fe:Mg = 6:1 (Popp et al., 1976).

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 3a: Earth’s earliest Hadean crust>4.50
9 : Lava/xenolith minerals (hornfels, sanidinite facies)
Near-surface Processes
26 : Hadean detrital minerals
Stage 5: Initiation of plate tectonics<3.5-2.5
40 : Regional metamorphism (greenschist, amphibolite, granulite facies)

Type Occurrence of Ferro-anthophylliteHide

Type Locality:
ⓘ Tamarack and Custer Mine, Placer Center Mining District, Shoshone County, Idaho, USA
General Appearance of Type Material:
Splintery-fibrous masses, with fibers to 6 cm in length.
Place of Conservation of Type Material:
The IMA does not designate any type material; the type description mentions the United States National
Museum (Cat. No. 93998).
Associated Minerals at Type Locality:
Galena

Synonyms of Ferro-anthophylliteHide

Other Language Names for Ferro-anthophylliteHide

Varieties of Ferro-anthophylliteHide

Aluminian FerroanthophylliteA discontinued amphibole name.

Relationship of Ferro-anthophyllite to other SpeciesHide

Member of:
Anthophyllite Root Name Group > Magnesium-iron-manganese Amphibole Subgroup > w(OH,F,Cl)-dominant Amphibole Group > Amphibole Supergroup
Other Members of Anthophyllite Root Name Group:
Anthophyllite◻Mg2Mg5(Si8O22)(OH)2Orth. mmm(2/m2/m2/m) : Pnma
Proto-anthophyllite◻Mg2Mg5(Si8O22)(OH)2Orth. mmm(2/m2/m2/m) : Pnnm
Proto-ferro-anthophyllite◻Fe2+2Fe2+5(Si8O22)(OH)2Orth. mmm(2/m2/m2/m)
'Sodic-ferro-anthophyllite'NaFe2+2Fe2+5(AlSi7O22)(OH)2Orth.
Forms a series with:
AnthophylliteAnthophyllite-Ferroanthophyllite Series

Related Minerals - Strunz-mindat GroupingHide

9.DD.05Suenoite◻Mn2+2Mg5Si8O22(OH)2Orth. mmm(2/m2/m2/m) : Pnma
9.DD.05Proto-ferro-anthophyllite◻Fe2+2Fe2+5(Si8O22)(OH)2Orth. mmm(2/m2/m2/m)
9.DD.05Proto-ferro-suenoite◻Mn2+2(Fe2+5)(Si8O22)(OH)2Orth. mmm(2/m2/m2/m)
9.DD.05PapikeiteNaMg2(Mg3Al2}(Al3Si5O22)(OH)2Orth. mmm(2/m2/m2/m) : Pnma
9.DD.05Gedrite◻Mg2(Mg3Al2)(Al2Si6O22)(OH)2Orth. mmm(2/m2/m2/m)
9.DD.05Holmquistite◻Li2(Mg3Al2)(Si8O22)(OH)2Orth. mmm(2/m2/m2/m) : Pnma
9.DD.05'Sodic-anthophyllite'{Na}{Mg2}{Mg5}(AlSi7O22)(OH)2Orth.
9.DD.05'Sodic-ferro-anthophyllite'NaFe2+2Fe2+5(AlSi7O22)(OH)2Orth.
9.DD.05Ferro-papikeiteNaFe2+2(Fe2+3Al2)(Si5Al3O22)(OH)2Orth. mmm(2/m2/m2/m) : Pnma
9.DD.05Proto-anthophyllite◻Mg2Mg5(Si8O22)(OH)2Orth. mmm(2/m2/m2/m) : Pnnm
9.DD.05Ferro-gedrite◻Fe2+2(Fe2+3Al2)(Al2Si6O22)(OH)2Orth. mmm(2/m2/m2/m) : Pnma
9.DD.05'Ferri-holmquistite'◻{Li2}{Mg3Fe3+2}(Si8O22)(OH)2
9.DD.05Ferro-ferri-holmquistite◻Li2(Fe2+3Fe3+2)(Si8O22)(OH)2Orth. mmm(2/m2/m2/m) : Pmma
9.DD.05Ferro-holmquistite◻Li2(Fe2+3Al2)(Si8O22)(OH)2Orth. mmm(2/m2/m2/m) : Pnma
9.DD.05Anthophyllite◻Mg2Mg5(Si8O22)(OH)2Orth. mmm(2/m2/m2/m) : Pnma

Other InformationHide

Thermal Behaviour:
Before the blowpipe the mineral fuses at a moderately high temperature to a black strongly magnetic slag. In the borax bead it reacts for iron and when fused with a large excess of sodium carbonate it reacts for manganese. Heated in a closed tube to a high temperature, it yields a small amount of water.
Notes:
Insoluble in acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Ferro-anthophylliteHide

References for Ferro-anthophylliteHide

Localities for Ferro-anthophylliteHide

Showing 8 localities.

This 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.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
China
 
  • Inner Mongolia
    • Xilingol League (Xilinguole Prefecture)
      • Plain Blue Banner (Zhenglan Co.)
Yiming Zhao et al. (2006) +1 other reference
Czech Republic
 
  • Olomouc Region
    • Šumperk District
      • Staré Město
        • Malé Vrbno
Mücke et al. (2006)
  • Vysočina Region
    • Žďár nad Sázavou District
      • Bory
Staněk (1991) +1 other reference
India
 
  • Odisha
Patel et al. (2001)
Romania
 
  • Suceava County
    • Iacobeni
minerals-of-the-carpathians.eu (2008)
USA (TL)
 
  • Idaho
    • Shoshone County
      • Placer Center Mining District
Rocks & Min. 70:262
  • Massachusetts
    • Essex County
Gleba (2008)
www.agu.org/cgi-bin/wais?l=V21B-01 +1 other reference
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