Kidwellite (original) (raw)
A valid IMA mineral species
About KidwelliteHide
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Formula:
NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33
Formula is slightly simplified; for details see Kolitsch (2004).
Colour:
Greenish yellow, Greenish white, Yellow, Light green
Lustre:
Resinous, Waxy, Silky, Dull
Specific Gravity:
3.04 - 3.3
Crystal System:
Monoclinic
Name:
Named by Paul (Paulus) B. Moore and Jum Ito in 1978 in honor of Albert Lewis (or Laws) Kidwell (1 January 1919, Auxvasse, Missouri, USA - 16 August 2008, Scottsdale, Arizona, USA), mineral collector and research geologist with Carter Oil Company and later Exxon Oil Company, Houston, Texas, USA.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:2202:2
133c8736-686d-493b-a664-3165cb887afe
IMA Classification of KidwelliteHide
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IMA Formula:
NaFe3+9+x(PO4)6(OH)11 · 3H2O (x ≈ 0.33)
Classification of KidwelliteHide
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8.DK.20
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
42.8.2.1
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : (AB)5(XO4)3Zq·xH2O
19.14.2
19 : Phosphates
14 : Phosphates of Fe and other metals
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Kdw | 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 KidwelliteHide
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Resinous, Waxy, Silky, Dull
Comment:
Frequently matte botryoids with a fine velvety surface
Colour:
Greenish yellow, Greenish white, Yellow, Light green
Cleavage:
Perfect
Perfect on {100}
Density:
3.04 - 3.3 g/cm3 (Measured) 3.34 g/cm3 (Calculated)
Optical Data of KidwelliteHide
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RI values:
_n_α = 1.787 _n_β = 1.800 _n_γ = 1.805
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Pleochroism:
Non-pleochroic
Chemistry of KidwelliteHide
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Mindat Formula:
NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33
Formula is slightly simplified; for details see Kolitsch (2004).
Crystallography of KidwelliteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 20.117 Å, b = 5.185 Å, c = 13.978 Å
β = 107.07°
Ratio:
a:b:c = 3.88 : 1 : 2.696
Unit Cell V:
1,393.77 ų (Calculated from Unit Cell)
Morphology:
Usually acicular, but may rarely form almost rod-like crystals.
Comment:
Single-crystal data; slightly As-bearing.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014570 | Kidwellite | Kolitsch U (2004) The crystal structures of kidwellite and 'laubmannite', two complex fibrous iron phosphates Mineralogical Magazine 68 147-165 |  |
2004 | Clara mine, Black Forest, Germany | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.41 Å | (100) |
| 6.43 Å | (30) |
| 4.017 Å | (35) |
| 3.813 Å | (40) |
| 3.413 Å | (55) |
| 3.193 Å | (40) |
| 3.173 Å | (35) |
Geological EnvironmentHide
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Geological Setting:
Rarely in phosphate-rich granite pegmatites
Type Occurrence of KidwelliteHide
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General Appearance of Type Material:
Olive green botryoids or bands within other phosphate mineral botryoids.
Geological Setting of Type Material:
Phosphate-bearing iron deposits
Associated Minerals at Type Locality:
Synonyms of KidwelliteHide
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Other Language Names for KidwelliteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of KidwelliteHide
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Other InformationHide
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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 KidwelliteHide
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References for KidwelliteHide
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Reference List:
Frost, Ray L., López, Andrés, Theiss, Frederick L., Scholz, Ricardo, Souza, Larissa (2014) The molecular structure of the phosphate mineral kidwellite NaFe3+9(PO4)6(OH)11⋅3H2O – A vibrational spectroscopic study. Journal of Molecular Structure, 1074. 429-434 doi:10.1016/j.molstruc.2014.06.055
Localities for KidwelliteHide
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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
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- 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.