Karenwebberite
A valid IMA mineral species
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About Karenwebberite
Formula:
NaFe2+PO4
Colour:
Pale green
Lustre:
Vitreous, Greasy
Specific Gravity:
3.65 (Calculated)
Crystal System:
Orthorhombic
Member of:
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."
Type Locality:
Dimorph of:
Unique Identifiers
Mindat ID:
42362
Long-form identifier:
mindat:1:1:42362:3
IMA Classification of Karenwebberite
Classification of Karenwebberite
8.AB.10
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
B : With medium-sized cations
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
38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
1 : ABXO4
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Kwb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Karenwebberite
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}.
In thin section it displays a perfect cleavage along {001}.
Fracture:
Irregular/Uneven
Density:
3.65 g/cm3 (Calculated)
Optical Data of Karenwebberite
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
Based on recorded range of RI values above.
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.
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:
Moderate
Pleochroism:
Visible
Comments:
Moderate with X = dark gray, Y = brown, and Z = yellow
Chemistry of Karenwebberite
Mindat Formula:
NaFe2+PO4
Element Weights:
Elements listed:
Crystallography of Karenwebberite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/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.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0019819 | Karenwebberite | Vignola P, Hatert F, Fransolet A M, Mendenbach O, Diella V, Ando 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 | 2013 | the Malpensata pegmatite, Lecco Province, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Karenwebberite
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 Karenwebberite
Other Language Names for Karenwebberite
Dutch:Karenwebberiet
German:Karenwebberit
Relationship of Karenwebberite to other Species
Member of:
Other Members of Triphylite Group:
| Heterosite | Fe3+(PO4) | Orth. mmm(2/m2/m2/m) : Pmna |
| Lithiophilite | LiMn2+PO4 | Orth. mmm(2/m2/m2/m) : Pmna |
| Natrophilite | NaMn2+PO4 | Orth. mmm(2/m2/m2/m) : Pmna |
| Purpurite | Mn3+(PO4) | Orth. mmm(2/m2/m2/m) : Pmna |
| Simferite | LiMg(PO4) | Orth. |
| Triphylite | LiFe2+PO4 | Orth. mmm(2/m2/m2/m) : Pmna |
Common Associates
Associations Based on Photo Data:
| 2 photos of Karenwebberite associated with Graftonite | Fe2+Fe2+2(PO4)2 |
| 1 photo of Karenwebberite associated with Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O |
Related Minerals - Strunz-mindat Grouping
| 8.AB. | Kryzaite | Na4(MgCr)(PO4)3 |
| 8.AB. | Niasite | Ni2+4.5(AsO4)3 |
| 8.AB. | Johanngeorgenstadtite | Ni2+4.5(AsO4)3 |
| 8.AB. | Rodolicoite | Fe3+PO4 |
| 8.AB. | Karwowskiite | Ca9Mg(Fe2+0.5◻0.5)(PO4)7 |
| 8.AB. | Olsenite | KFe4(PO4)3 |
| 8.AB. | Borisenkoite | Cu3[(V,As)O4]2 |
| 8.AB.05 | Farringtonite | Mg3(PO4)2 |
| 8.AB.10 | Natrophilite | NaMn2+PO4 |
| 8.AB.10 | 'Sicklerite' | Li1-x(Mn3+xMn2+1-x)PO4 |
| 8.AB.10 | Simferite | LiMg(PO4) |
| 8.AB.10 | Heterosite | Fe3+(PO4) |
| 8.AB.10 | Lithiophilite | LiMn2+PO4 |
| 8.AB.10 | Triphylite | LiFe2+PO4 |
| 8.AB.10 | 'Ferrisicklerite' | Li1-x(Fe3+xFe2+1-x)PO4 |
| 8.AB.10 | Purpurite | Mn3+(PO4) |
| 8.AB.15 | Zavalíaite | Mn2+3(PO4)2 |
| 8.AB.15 | Chopinite | Mg3(PO4)2 |
| 8.AB.15 | Sarcopside | Fe2+3(PO4)2 |
| 8.AB.20 | Beusite | Mn2+Mn2+2 (PO4)2 |
| 8.AB.20 | Graftonite-(Ca) | CaFe2+2(PO4)2 |
| 8.AB.20 | Graftonite-(Mn) | MnFe2+2(PO4)2 |
| 8.AB.20 | Graftonite | Fe2+Fe2+2(PO4)2 |
| 8.AB.20 | Beusite-(Ca) | CaMn2+2(PO4)2 |
| 8.AB.25 | Xanthiosite | Ni3(AsO4)2 |
| 8.AB.30 | Lammerite | Cu3(AsO4)2 |
| 8.AB.30 | Paralammerite | Cu3(AsO4)2 |
| 8.AB.35 | Mcbirneyite | Cu3(VO4)2 |
| 8.AB.35 | Pseudolyonsite | Cu3(VO4)2 |
| 8.AB.35 | Stranskiite | Zn2Cu(AsO4)2 |
| 8.AB.40 | Michalskiite | Fe3+1.33Cu2+2(MgFe3+)2(VO4)6 |
| 8.AB.40 | Lyonsite | Cu3Fe4(VO4)6 |
Fluorescence of Karenwebberite
Non-fluorescent either under short-wave or long-wave ultraviolet light
Other Information
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 Karenwebberite
mindat.org URL:
https://www.mindat.org/min-42362.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Karenwebberite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011, CNMNC Newsletter No. 10. Mineralogical Magazine, 75 (5) 2549-2561 doi:10.1180/minmag.2011.075.5.2549
Localities for Karenwebberite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Africa | |
| V. V. Sharygin (2016) |
Italy (TL) | |
| Williams et al. (2011) +1 other reference |
Quick NavTopAbout KarenwebberiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Malpensata pegmatitic dyke, Piona Peninsula, Colico, Lecco Province, Lombardy, Italy