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Ferro-papikeite

A valid IMA mineral species
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05836670017271951658164.jpg
Ferro-papikeite

Kawai mine, Ena City, Gifu Prefecture, Japan
05836670017271951658164.jpg
Ferro-papikeite

Kawai mine, Ena City, Gifu Prefecture, Japan
05836670017271951658164.jpg
Ferro-papikeite

Kawai mine, Ena City, Gifu Prefecture, Japan
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About Ferro-papikeiteHide

Formula:
NaFe2+2(Fe2+3Al2)(Si5Al3O22)(OH)2
Colour:
pale brown
Hardness:
6
Specific Gravity:
3.488 (Calculated)
Crystal System:
Orthorhombic
Name:
Named according to the IMA rules for the amphiboles, indicating its relationship to papikeite, with iron substituting for magnesium. Note that at the time of publication, papikeite has yet to be described. The papikeite group / root name is in honor of James J. (‘Jim’) Papike (11 February 1937, Eveleth, Minnesota, USA - 21 December 2020), professor and mineralogist at the Institute of Meteoritics, University of New Mexico, USA. He determined the structures of many amphiboles and pyroxenes at ambient and high temperatures. He is also past president of the Mineralogical Society of America.
Crystal structure details:

* [6]Al3+ is ordered over the four T sites: T1B > T1A > T2B >> T2a
* [6]Al3+ completely ordered at M2
* Fe2+ strongly ordered at M4
* split A site, with Na+ strongly ordered at A1

Relation (of the end-member) to end-member gedrite: Na+ → ◻, Fe2+ → Mg, Al3+ → Si4+.




Unique IdentifiersHide

Mindat ID:
54667
Long-form identifier:
mindat:1:1:54667:8

IMA Classification of Ferro-papikeiteHide

IMA status:
Approved
IMA Formula:
NaFe2+5Al2(Si5Al3)O22(OH)2
Approval year:
2020

Classification of Ferro-papikeiteHide

Strunz-mindat (2026):
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 for Standard
FpaIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of Ferro-papikeiteHide

Transparency:
Translucent
Colour:
Pale brown
Streak:
Colorless to very pale brown
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{210}; cleavage systems intersecting at ~56°
Fracture:
Splintery
Density:
3.488 g/cm3 (Calculated)

Optical Data of Ferro-papikeiteHide

Type:
Biaxial (+)
RI values:
nα = 1.674(2) nβ = 1.692(2) nγ = 1.716(2)
2V:
Measured: 86.2° (9), Calculated: 88.3°
Max. Birefringence:
δ = 0.042
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
weak r < v
Pleochroism:
Visible
Comments:
X= very pale brown Y = Z = honey brown

Chemistry of Ferro-papikeiteHide

Mindat Formula:
NaFe2+2(Fe2+3Al2)(Si5Al3O22)(OH)2
Element Weights:
Element% weight
O39.851 %
Fe28.979 %
Si14.574 %
Al14.001 %
Na2.386 %
H0.209 %

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

Crystallography of Ferro-papikeiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 18.628(4) Å, b = 17.888(4) Å, c = 5.303(1) Å
Ratio:
a:b:c = 1.041 : 1 : 0.296
Unit Cell V:
1,767.05 ų (Calculated from Unit Cell)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.255 Å(99)
3.223 Å(39)
3.056 Å(68)
2.674 Å(41)
2.572 Å(56)
2.549 Å(38)
2.501 Å(50)
1.991 Å(31)

Type Occurrence of Ferro-papikeiteHide

Type Locality:
ⓘ Ferro-papikeite type locality, Nordmark mining district, Filipstad, Värmland County, Sweden
General Appearance of Type Material:
subhedral grains, 0.4–3.0 mm in size, and sheaf like aggregates of prismatic crystals
Place of Conservation of Type Material:
Mineralogical collection of the Royal Ontario Museum, 100 Queens Park, Toronto, ON M5S 2C6, Canada, accession number M60100.
Geological Setting of Type Material:
medium-grade felsic metavolcanic rock, of the lower amphibolite facies
Associated Minerals at Type Locality:
BiotiteChlorite GroupQuartz

Synonyms of Ferro-papikeiteHide

Other Language Names for Ferro-papikeiteHide

Relationship of Ferro-papikeite to other SpeciesHide

Member of:
Papikeite Root Name Group > Magnesium-iron-manganese Amphibole Subgroup > w(OH,F,Cl)-dominant Amphibole Group > Amphibole Supergroup
Other Members of Papikeite Root Name Group:
PapikeiteNaMg2(Mg3Al2}(Al3Si5O22)(OH)2Orth. mmm(2/m2/m2/m) : Pnma

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-anthophyllite◻Fe2+2Fe2+5(Si8O22)(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

Fluorescence of Ferro-papikeiteHide

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 Ferro-papikeiteHide

References for Ferro-papikeiteHide

Localities for Ferro-papikeiteHide

Showing 6 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.
Finland
 
  • Pirkanmaa
    • Orivesi
Probed
Japan
 
  • Gifu Prefecture
    • Ena City
recalculation of analysis published in Satoshi Matsubara et al (1980)
Spain
 
  • Andalusia
    • Málaga
      • Antequera
Christian Rewitzer collection +1 other reference
Sweden
 
  • Värmland County
    • Filipstad
Linthout et al. (1996) +1 other reference
Hawthorne et al. (2022)
USA
 
  • California
    • Fresno County
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