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Karenwebberite

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Formula:
NaFe2+PO4
Colour:
Pale green
Lustre:
Vitreous, Greasy
Specific Gravity:
3.65 (Calculated)
Crystal System:
Orthorhombic
Name:
In honor of Karen Louise Webber, Assistant Professor Research at the Mineralogy, Petrology and Pegmatology Research Group, Department of Earth and Environmental Sciences, University of New Orleans, Louisiana, U.S.A. Her research "has focused on the cooling and crystallization dynamics of granitic pegmatites."
Dimorph of:
Fe-equivalent of natrophilite or to the Na-equivalent of triphylite.


Hide all sections | Show all sections

Classification of KarenwebberiteHide

Approved
Approval Year:
2011
First Published:
2013
8.AB.10

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
B : With medium-sized cations
38.1.1.4

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
1 : ABXO4

Physical Properties of KarenwebberiteHide

Vitreous, Greasy
Colour:
Pale green
Comment:
Lamellae are translucent (pale green) to opaque (dark green).
Streak:
Very pale grayish-green
Tenacity:
Brittle
Cleavage:
Perfect
In thin section it displays a perfect cleavage along {001}.
Fracture:
Irregular/Uneven
Density:
3.65 g/cm3 (Calculated)

Optical Data of KarenwebberiteHide

Type:
Biaxial (+)
RI values:
nα = 1.701(2) nβ = 1.708(2) nγ = 1.717(2)
2V:
Measured: 87° , Calculated: 41°
Max Birefringence:
δ = 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Visible
Comments:
Moderate with X = dark gray, Y = brown, and Z = yellow

Chemical Properties of KarenwebberiteHide

Formula:
NaFe2+PO4
IMA Formula:
Na(Fe2+,Mn2+)(PO4)

Crystallography of KarenwebberiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 4.882(1) Å, b = 10.387(2) Å, c = 6.091(1) Å
Ratio:
a:b:c = 0.47 : 1 : 0.586
Unit Cell V:
308.9 ų
Z:
4
Morphology:
Forms thin exsolution lamellae (< 0.1 x 7 mm) in graftonite.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.867 Å(97)
4.519 Å(77)
3.702 Å(46)
3.609 Å(82)
2.880 Å(75)
2.552 Å(100)
2.469 Å(96)
1.817 Å(42)

Type Occurrence of KarenwebberiteHide

General Appearance of Type Material:
Late-magmatic-stage exsolution lamellae up to 100 μm thick in graftonite.
Place of Conservation of Type Material:
Laboratory of Mineralogy, University of Liege, Belgium, cat. no. 20385
Geological Setting of Type Material:
Pegmatite dyke
Associated Minerals at Type Locality:

Synonyms of KarenwebberiteHide

Relationship of Karenwebberite to other SpeciesHide

Other Members of this group:
FerrisickleriteLi1-x(Fe3+xFe2+1-x)PO4Orth.
Heterosite(Fe3+,Mn3+)PO4Orth. mmm (2/m 2/m 2/m) : Pmna
LithiophiliteLiMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
NatrophiliteNaMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
PurpuriteMn3+(PO4)Orth. mmm (2/m 2/m 2/m) : Pmna
SickleriteLi1-x(Mn3+xMn2+1-x)PO4Orth.
TriphyliteLiFe2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna

Common AssociatesHide

GraftoniteFe2+Fe2+2(PO4)2

Related Minerals - Nickel-Strunz GroupingHide

8.AB.BorisenkoiteCu3[(V,As)O4]2Mon. 2/m : P21/b
8.AB.05FarringtoniteMg3(PO4)2Mon. 2/m
8.AB.10FerrisickleriteLi1-x(Fe3+xFe2+1-x)PO4Orth.
8.AB.10Heterosite(Fe3+,Mn3+)PO4Orth. mmm (2/m 2/m 2/m) : Pmna
8.AB.10LithiophiliteLiMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
8.AB.10NatrophiliteNaMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
8.AB.10PurpuriteMn3+(PO4)Orth. mmm (2/m 2/m 2/m) : Pmna
8.AB.10SickleriteLi1-x(Mn3+xMn2+1-x)PO4Orth.
8.AB.10SimferiteLi(Mg,Fe3+,Mn3+)2(PO4)2Orth.
8.AB.10TriphyliteLiFe2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
8.AB.15Sarcopside(Fe2+,Mn2+,Mg)3(PO4)2Mon. 2/m : P21/b
8.AB.15Chopinite(Mg,Fe2+)3(PO4)2Mon. 2/m : P21/b
8.AB.20BeusiteMn2+Mn2+2 (PO4)2Mon.
8.AB.20GraftoniteFe2+Fe2+2(PO4)2Mon. 2/m : P21/b
8.AB.25XanthiositeNi3(AsO4)2Mon. 2/m : P21/b
8.AB.30LammeriteCu3(AsO4)2Mon.
8.AB.30Lammerite-βCu3(AsO4)2Mon. 2/m : P21/b
8.AB.35McbirneyiteCu3(VO4)2Tric. 1 : P1
8.AB.35StranskiiteZn2Cu(AsO4)2Tric. 1 : P1
8.AB.35PseudolyonsiteCu3(VO4)2Mon. 2/m : P21/b
8.AB.40LyonsiteCu3Fe4(VO4)6Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

38.1.1.1TriphyliteLiFe2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
38.1.1.2LithiophiliteLiMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
38.1.1.3NatrophiliteNaMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna

Fluorescence of KarenwebberiteHide

Non-fluorescent either under short-wave or long-wave ultraviolet light

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.

References for KarenwebberiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Vignola, p. et al (2011) Karenwebberite, IMA 2011-015. CNMNC Newsletter No. 10, October 2011, p. 2551; Mineralogical Magazine: 75: 2549-2561.
Vignola, P., Hatert, F., Fransolet, A.-M., Medenbach, O., Diella, V., Andò, S. (2013) Karenwebberite, Na(Fe2+,Mn2+)PO4, a new member of the triphylite group from the Malpensata pegmatite, Lecco Province, Italy. American Mineralogist: 98: 767-772.

Internet Links for KarenwebberiteHide

Localities for KarenwebberiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Lombardy
    • Lecco Province
      • Colico
        • Piona Peninsula
Vignola, P., Hatert, F., Fransolet, A.-M., Medenbach, O., Diella, V., Andò, S. (2013): Karenwebberite, Na(Fe 2+,Mn 2+)PO4, a new member of the triphylite group from the Malpensata pegmatite, Lecco Province, Italy. American Mineralogist, 98, 767-772.
North Africa
 
  • Sahara Desert
V. V. Sharygin, N. S. Karmanov and N. M. Podgornykh (2016) Na-Fe-Phosphate Globules in Impact Metal-Troilite Associations of Chelyabinsk Meteorite. 79th Annual Meeting of the Meteoritical Society (2016)
 
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