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Proto-ferro-anthophyllite

A valid IMA mineral species
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Formula:
◻{Fe2+2}{Fe2+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 composition is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.

Proto-ferro-anthophyllite has a Pnmn space group symmetry and is defined with Fe2+ as the dominant element both in the B and C positions.
Colour:
brownish yellow
Lustre:
Vitreous
Specific Gravity:
3.54 (Calculated)
Crystal System:
Orthorhombic
This page provides mineralogical data about Proto-ferro-anthophyllite.


Hide all sections | Show all sections

Unique IdentifiersHide

Mindat ID:
7254
Long-form identifier:
mindat:1:1:7254:6
GUID
(UUID V4):
ce3f7443-154e-4b75-9f2f-f3cde1f02343

IMA Classification of Proto-ferro-anthophylliteHide

IMA status:
Approved
IMA status notes:
Redefined by the IMA
IMA Formula:
◻Fe2+2Fe2+5Si8O22(OH)2
Approval history:
Redefined in Hawthorne et al. (2012), amphibole nomenclature report.
Type description reference:
Hirukawa-mura, S. Y. (2002). Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferro-anthophyllite from Cheyenne Canyon and Cheyenne Mountain, USA and. Journal of Mineralogical ana’Petrological Sciences, 97, 127-136.

Classification of Proto-ferro-anthophylliteHide

Strunz-mindat (2024):
9.DD.05

9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles

Mineral SymbolsHide

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

SymbolSourceReference
PfathIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of Proto-ferro-anthophylliteHide

Lustre:
Vitreous
Transparency:
Transparent
Colour:
brownish yellow
Streak:
white
Cleavage:
Perfect
(210)
Density:
3.54 g/cm3 (Calculated)

Optical Data of Proto-ferro-anthophylliteHide

Type:
Biaxial (-)
RI values:
nα = 1.690 nβ = 1.710 nγ = 1.726
Max Birefringence:
δ = 0.036
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemistry of Proto-ferro-anthophylliteHide

Mindat Formula:
◻{Fe2+2}{Fe2+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 composition is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.

Proto-ferro-anthophyllite has a Pnmn space group symmetry and is defined with Fe2+ as the dominant element both in the B and C positions.
Elements listed:
Fe, H, O, Si - search for minerals with similar chemistry

Crystallography of Proto-ferro-anthophylliteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 9.388(2) Å, b = 18.387(4) Å, c = 5.347(1) Å
Ratio:
a:b:c = 0.511 : 1 : 0.291
Unit Cell V:
922.98 ų (Calculated from Unit Cell)
Z:
2
Comment:
Pnmn

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
8.353 Å(100)
3.669 Å(20)
3.277 Å(33)
3.074 Å(64)
2.560 Å(92)
2.537 Å(24)
2.317 Å(31)
1.535 Å(31)

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)
Stage 4a: Earth’s earliest continental crust>4.4-3.0
19 : Granitic intrusive rocks

Type Occurrence of Proto-ferro-anthophylliteHide

Co-Type Localities:
ⓘ Tawara (Tahara), Hirukawa, Nakatsugawa City, Gifu Prefecture, Japan
ⓘ Cheyenne Mt area, El Paso County, Colorado, USA
General Appearance of Type Material:
acicular
Geological Setting of Type Material:
fayalite masses in granitic pegmatites
Associated Minerals at Type Locality:
FayaliteLaihuniteMagnetiteQuartz
Reference:
Hirukawa-mura, S. Y. (2002). Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferro-anthophyllite from Cheyenne Canyon and Cheyenne Mountain, USA and. Journal of Mineralogical ana’Petrological Sciences, 97, 127-136.

Synonyms of Proto-ferro-anthophylliteHide

Other Language Names for Proto-ferro-anthophylliteHide

Relationship of Proto-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 this group:
Anthophyllite◻{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
Ferro-anthophyllite◻{Fe2+2}{Fe2+5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
Proto-anthophyllite◻{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnnm
Sodic-ferro-anthophyllite{Na}{Fe2+2}{Fe2+5}(AlSi7O22)(OH)2Orth.

Related Minerals - Strunz-mindat GroupingHide

9.DD.05Anthophyllite◻{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.DD.05Ferro-anthophyllite◻{Fe2+2}{Fe2+5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.DD.05Ferro-gedrite◻{Fe2+2}{Fe2+3Al2}(Al2Si6O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.DD.05Gedrite◻{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2Orth. mmm (2/m 2/m 2/m)
9.DD.05Holmquistite◻{Li2}{Mg3Al2}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.DD.05Proto-ferro-suenoite◻{Mn2+2}{Fe2+5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m)
9.DD.05Sodic-anthophyllite{Na}{Mg2}{Mg5}(AlSi7O22)(OH)2Orth.
9.DD.05Sodic-ferro-anthophyllite{Na}{Fe2+2}{Fe2+5}(AlSi7O22)(OH)2Orth.
9.DD.05Ferro-holmquistite◻{Li2}{Fe2+3Al2}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.DD.05Proto-anthophyllite◻{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnnm
9.DD.05LavinskyiteK(LiCu)Cu6(Si4O11)2(OH)4Orth.
9.DD.05PapikeiteNaMg2(Mg3Al2}(Al3Si5O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.DD.05Ferri-holmquistite◻{Li2}{Mg3Fe3+2}(Si8O22)(OH)2
9.DD.05Ferro-ferri-holmquistite◻{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pmma
9.DD.05Suenoite◻Mn2Mg5Si8O22(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.DD.05Ferro-papikeiteNaFe2+2(Fe2+3Al2)(Si5Al3O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

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 Proto-ferro-anthophylliteHide

References for Proto-ferro-anthophylliteHide

Localities for Proto-ferro-anthophylliteHide

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.

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.
Japan
 
  • Gifu Prefecture
    • Nakatsugawa City
Min.Rec.: 32: 418 +3 other references
J. Mineral. Petrol. Sci.
USA (TL)
 
  • Colorado
    • El Paso County
Am.Min.: 84: 196 +1 other reference
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