Meurigite-K
A valid IMA mineral species
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About Meurigite-K
John Meurig Thomas
Formula:
KFe3+8(PO4)6(OH)7 · 6.5H2O
Colour:
Yellowish brown, cream to white, pale to canary yellow
Lustre:
Sub-Vitreous, Waxy, Silky
Hardness:
3
Specific Gravity:
2.96
Crystal System:
Monoclinic
Name:
Named meurigite in 1996 by William D. Birch, Allan Pring, P. G. Self, R. B. Gibbs, E. Kleck, Martin C. Jensen, Eugene Edward Foord in honor of John Meurig Thomas [born 15 December, 1932 Llanelli, South Wales, United Kingdom - died 13 November, 2020], a prolific reasearcher and crystal chemist known for his work on heterogeneous catalysis, solid-state chemistry, and surface and materials science, University of Cambridge, Cambridge, England, UK. It was renamed in 2009 to meurigite-K, after the discovery and description of a sodium analogue meurigite-Na.
Obituary:
https://www.iucr.org/news/newsletter/etc/articles?issue=150473&result_138339_result_page=20
Obituary:
https://www.iucr.org/news/newsletter/etc/articles?issue=150473&result_138339_result_page=20
Possibly identical to phosphofibrite (Kolitsch, 1999; Kampf & Kolitsch, 2008 and Kampf et al., 2009), although the latter appears to be K-deficient (K < 0.5 pfu).
See also the sodium analogue meurigite-Na.
Previously called meurigite (renamed in 2009).
See also the sodium analogue meurigite-Na.
Previously called meurigite (renamed in 2009).
Unique Identifiers
Mindat ID:
7178
Long-form identifier:
mindat:1:1:7178:5
GUID
(UUID V4):
(UUID V4):
5470c288-c6d3-4463-9439-86ac58f70686
IMA Classification of Meurigite-K
Approved
IMA status notes:
Renamed by the IMA
Approval year:
1995
First published:
1996
Approval history:
Renamed from meurigite to meurigite-K in 2009.
Classification of Meurigite-K
8.DJ.20
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1
42.13.14.1
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous
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 |
|---|---|---|
| Meu-K | 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 Meurigite-K
Sub-Vitreous, Waxy, Silky
Transparency:
Translucent
Comment:
Depending on the packing of the fibers.
Colour:
Yellowish brown, cream to white, pale to canary yellow
Streak:
White
Hardness:
3 on Mohs scale
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Fracture:
None observed
Density:
2.96 g/cm3 (Measured) 2.86 g/cm3 (Calculated)
Optical Data of Meurigite-K
Type:
Biaxial (+)
RI values:
nα = 1.780(5) nβ = 1.785(5) nγ = 1.800(5)
2V:
Calculated: 60°
Birefringence:
0.020
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v distinct
Pleochroism:
Non-pleochroic
Chemistry of Meurigite-K
Mindat Formula:
KFe3+8(PO4)6(OH)7 · 6.5H2O
Crystallography of Meurigite-K
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 29.018(5) Å, b = 5.1892(6) Å, c = 19.695(3) Å
β = 106.987(1)°
β = 106.987(1)°
Ratio:
a:b:c = 5.592 : 1 : 3.795
Unit Cell V:
2836.3 ų
Z:
4
Morphology:
Tabular on [001] and elongated parallel to [010].
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
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Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
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View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0004452 | Meurigite-K | Kampf A R, Pluth J J, Chen Y S (2007) The crystal structure of meurigite American Mineralogist 92 1518-1524 |  | 2007 | Santa Rita mine, Grant County, New Mexico | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.41 Å | (60) |
| 4.84 Å | (90) |
| 4.32 Å | (70) |
| 4.25 Å | (50) |
| 3.470 Å | (60) |
| 3.216 Å | (100) |
| 3.116 Å | (80) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Meurigite-K
General Appearance of Type Material:
Drusy coating of fibrous yellow rosettes.
Place of Conservation of Type Material:
Not described.
Geological Setting of Type Material:
Oxide zone of a copper deposit.
Associated Minerals at Type Locality:
Synonyms of Meurigite-K
Other Language Names for Meurigite-K
German:Meurigit-K
Spanish:Meurigita-K
Common Associates
Associated Minerals Based on Photo Data:
| 18 photos of Meurigite-K associated with Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 17 photos of Meurigite-K associated with Quartz | SiO2 |
| 15 photos of Meurigite-K associated with Leucophosphite | KFe3+2(PO4)2(OH) · 2H2O |
| 13 photos of Meurigite-K associated with Strengite | FePO4 · 2H2O |
| 11 photos of Meurigite-K associated with Cacoxenite | Fe3+24AlO6(PO4)17(OH)12 · 75H2O |
| 9 photos of Meurigite-K associated with Variscite | AlPO4 · 2H2O |
| 8 photos of Meurigite-K associated with Limonite | |
| 7 photos of Meurigite-K associated with Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O |
| 6 photos of Meurigite-K associated with Tinticite | Fe3+3(PO4)2(OH)3 · 3H2O |
| 6 photos of Meurigite-K associated with Cyrilovite | NaFe3+3(PO4)2(OH)4 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 8.DJ.05 | Johnwalkite | K(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH) |
| 8.DJ.05 | Olmsteadite | KFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2O |
| 8.DJ.10 | Gatumbaite | CaAl2(PO4)2(OH)2 · H2O |
| 8.DJ.15 | Camgasite | CaMg(AsO4)(OH) · 5H2O |
| 8.DJ.20 | Phosphofibrite | (H2O,K)3.5Fe8(PO4)6(OH)7 · 5H2O |
| 8.DJ.20 | Meurigite-Na | NaFe3+8(PO4)6(OH)7 · 6.5H2O |
| 8.DJ.25 | Jungite | Ca2Zn4Fe3+8(PO4)9(OH)9 · 16H2O |
| 8.DJ.30 | Wycheproofite | NaAlZr(PO4)2(OH) · H2O |
| 8.DJ.35 | Ercitite | Na2Mn3+2(PO4)2(OH)2 · 4H2O |
| 8.DJ.40 | Mrázekite | Bi2Cu3(PO4)2O2(OH)2 · H2O |
| 8.DJ.45 | Attikaite | Ca3Cu2Al2(AsO4)4(OH)4 · 2H2O |
| 8.DJ.50 | Mengeite | Ba(Mg,Mn2+)Mn3+4(PO4)4(OH)4 · 4H2O |
Fluorescence of Meurigite-K
Not fluorescent in UV
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 Meurigite-K
mindat.org URL:
https://www.mindat.org/min-7178.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Meurigite-K
Localities for Meurigite-K
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.
Australia | |
| Mineralogical Magazine +1 other reference |
Brazil | |
| Menezes (n.d.) |
| Luis Menezes specimens at Denver show +1 other reference |
Chile | |
| Sulphides analysed by geology dep. of ... +1 other reference |
Czech Republic | |
| Janouš +4 other references |
| Sejkora J. et al. (Česká republika) |
| S. Mirete photo |
France | |
| Cuchet et al. (2000) |
| Gayraud et al. (2011) |
| Lheur et al. (2013) |
Germany | |
| WALENTA et al. (2001) |
| Dill et al. (2009) |
| www.berthold-weber.de (2001) |
| Wittern (2001) | |
| Wittern (2001) |
USA | |
| LaPointe et al. (199) |
| Castor et al. (2004) | |
| Dr. William S. Wise presentation to ... |
| Jensen et al. (2001) |
| Mineralogical Magazine 60:787-793. +1 other reference |
| Mineral Webzine |
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Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria, Germany