Donate now to keep alive!Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
What is a mineral?The most common minerals on earthMineral PhotographyThe Elements and their MineralsGeological TimeMineral Evolution
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
John Meurig Thomas
KFe3+8(PO4)6(OH)7 · 6.5H2O
Yellowish brown, cream to white, pale to canary yellow
Sub-Vitreous, Waxy, Silky
Specific Gravity:
Crystal System:
Named 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 December 15, 1932 Llanelli, South Wales, United Kingdom], 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.
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).

Hide all sections | Show all sections

Classification of Meurigite-KHide

Approval Year:

D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1

13 : Miscellaneous

Physical Properties of Meurigite-KHide

Sub-Vitreous, Waxy, Silky
depending on the packing of the fibers
Yellowish brown, cream to white, pale to canary yellow
Hardness Data:
None observed
2.96 g/cm3 (Measured)    2.86 g/cm3 (Calculated)

Optical Data of Meurigite-KHide

Biaxial (+)
RI values:
nα = 1.780(5) nβ = 1.785(5) nγ = 1.800(5)
Calculated: 60°
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
r > v distinct

Chemical Properties of Meurigite-KHide

KFe3+8(PO4)6(OH)7 · 6.5H2O
IMA Formula:
[K(H2O)2.5][Fe3+8(PO4)6(OH)7] · 4H2O

Crystallography of Meurigite-KHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 29.018(5) Å, b = 5.1892(6) Å, c = 19.695(3) Å
β = 106.987(1)°
a:b:c = 5.592 : 1 : 3.795
Unit Cell V:
2836.3 ų
tabular on [001] and elongated parallel to [010]

X-Ray Powder DiffractionHide

Powder Diffraction Data:
9.41 (60)
4.84 (90)
4.32 (70)
4.25 (50)
3.470 (60)
3.216 (100)
3.116 (80)

Type Occurrence of Meurigite-KHide

General Appearance of Type Material:
Drusy coating of fibrous yellow rosettes
Geological Setting of Type Material:
Oxide zone of a copper deposit
Associated Minerals at Type Locality:

Synonyms of Meurigite-KHide

Other Language Names for Meurigite-KHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
Leucophosphite7 photos of Meurigite-K associated with Leucophosphite on
Wavellite4 photos of Meurigite-K associated with Wavellite on
Strengite4 photos of Meurigite-K associated with Strengite on
Ruifrancoite3 photos of Meurigite-K associated with Ruifrancoite on
Quartz3 photos of Meurigite-K associated with Quartz on
Variscite3 photos of Meurigite-K associated with Variscite on
Turquoise3 photos of Meurigite-K associated with Turquoise on
Rockbridgeite3 photos of Meurigite-K associated with Rockbridgeite on
Cyrilovite3 photos of Meurigite-K associated with Cyrilovite on
Cacoxenite2 photos of Meurigite-K associated with Cacoxenite on

Related Minerals - Nickel-Strunz GroupingHide

8.DJ.05JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)Orth.
8.DJ.05OlmsteaditeKFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2OOrth.
8.DJ.10GatumbaiteCaAl2(PO4)2(OH)2 · H2OMon. 2/m : P2/m
8.DJ.15CamgasiteCaMg(AsO4)(OH) · 5H2OMon. 2/m : P21/m
8.DJ.20Phosphofibrite(H2O,K)3.5Fe8(PO4)6(OH)7 · 5H2OMon. 2/m
8.DJ.20Meurigite-NaNaFe3+8(PO4)6(OH)7 · 6.5H2OMon. 2/m : B2/b
8.DJ.25JungiteCa2Zn4Fe3+8(PO4)9(OH)9 · 16H2OOrth.
8.DJ.30WycheproofiteNaAlZr(PO4)2(OH) · H2OTric.
8.DJ.35ErcititeNa2Mn3+2(PO4)2(OH)2 · 4H2OMon.
8.DJ.40MrázekiteBi2Cu3(PO4)2O2(OH)2 · H2OMon. 2/m
8.DJ.45AttikaiteCa3Cu2Al2(AsO4)4(OH)4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pban

Related Minerals - Dana Grouping (8th Ed.)Hide · 6.5H2OMon. 2/m : B2/b,K)3.5Fe8(PO4)6(OH)7 · 5H2OMon. 2/m

Fluorescence of Meurigite-KHide

Not fluorescent in UV

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 Meurigite-KHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Birch, W. D., Pring, A., Self, P. G., Gibbs, R. B., Keck, E., Jensen, M. C. and Foord, E. E. (1996): Meurigite, a new fibrous iron phosphate resembling kidwellite. Mineralogical Magazine 60, 787-793.
Kolitsch, U. (1999): Evidence for the identity of meurigite and phosphofibrite by transmission electron microscopy and X-ray powder diffraction. European Journal of Mineralogy: 11, Beih. No. 1, 132.
Mineralogical Record: 28: 143.
Kampf, A.R., J.J.Pluth, & Y. Chen (2007): The crystal structure of meurigite. American Mineralogist 92, 1518-1534.
A. R. Kampf and U. Kolitsch (2008): The relationship between phosphofibrite and meurigite. M&M6, 6th Intern. Conf. on Mineralogy & Museums, Colorado School of Mines, Golden, Colorado, USA, September 7-9, 2008; Program and Abstract Volume, 26.
A. R. Kampf, P. M. Adams, U. Kolitsch and I. M. Steele (2009): Meurigite-Na, a new species, and the relationship between phosphofibrite and meurigite. Am. Mineral. 94, 720-727.

Internet Links for Meurigite-KHide

Localities for Meurigite-KHide

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.
  • Victoria
    • Buloke Shire
      • Wycheproof
Mineralogical Magazine, 60, 787-793 W.D.Birch 1996. Portlandite and other recent mineral discoveries in the granites at Lake Boga, Wycheproof and Pyramid Hill, Victoria. Australian Journal of Mineralogy Vol.2, No.2, Dec. 1996
  • Minas Gerais
    • Conselheiro Pena
Luiz Menezes
    • Galiléia
      • Sapucaia do Norte
Luis Menezes specimens at Denver show, 2008.
  • Tarapacá Region
    • El Tamarugal Province
      • Collahuasi District
Sulphides analysed by geology dep. of company; sulphates, phosphates, analysed by Bob Jenkins (Usa) 2007
Czech Republic
  • Bohemia (Böhmen; Boehmen)
    • Plzeň Region
      • Rokycany (Rokitzan; Rokytzan)
Janouš, F.: Minerály z Kněží hory u Těškova (okres Rokycany), Minerál, 1995, roč. 3, č. 6, s. 367-369.
    • South Bohemia Region
      • Písek
Sejkora J., Cícha J., Jebavá I.: Minerální asociace fosfátů z Čížové u Písku (Česká republika). Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 2011, 19, 1, 1-26.
S. Mirete photo
  • Auvergne-Rhône-Alpes
    • Allier
      • Ébreuil
        • Échassières
Le Règne Minéral, (33), 5-25.
  • Occitanie
    • Aveyron
      • La Capelle-Bleys
Gayraud, L., Gineste, C., Bernadi, G. & Johannet, J.-M. (2011) - Bleys et Puech de Compolibat: deux localités minéralogiques remarquables du massif de leucogranite de La Capelle-Bleys (Aveyron), Le Cahier des Micromonteurs, 111(1), 7-23
    • Tarn
      • Castelnau-de-Brassac
        • Fumade
Lheur, C. & Meisser, N. (2013): Nouveautés à Fumade (Tarn): clinobisvanite, meurigite-K, sigloite et sudoite. Le Règne Minéral, 110, 52-53.
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
WALENTA, K. and THEYE, T. (2001): Meurigit von der Grube Clara. Aufschluss 52, 243-246.
  • Bavaria
    • Upper Palatinate
      • Pleystein
Dill, H.G., Weber, B. (2009), Pleystein-City on Pegmatite, 4th International Symposium on Granitic Pegmatites, Recife, Brazil.
      • Waidhaus
        • Hagendorf
Wittern: "Mineralfundorte in Deutschland", 2001
  • Saxony
    • Oberlausitz
      • Görlitz
        • Rengersdorf
Wittern: "Mineralfundorte in Deutschland", 2001
  • Nevada
    • Eureka Co.
      • Carlin Trend
        • Maggie Creek Subdistrict
NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
      • Lynn District
NBMG Spec. Pub. 31 Minerals of Nevada
    • Humboldt Co.
      • Iron Point District
        • Valmy
Dr. William S. Wise presentation to Northwest Micro Mineral Study Group on 1 May 2004, Update on Mineralogy of the Silver Coin Mine, Iron Point District, Edna Mountains, Humboldt Co., Nevada
    • Pershing Co.
      • Humboldt Range
        • Willard District
[MinRec 32:297]
  • New Mexico
    • Grant Co.
      • Santa Rita District
        • Santa Rita
Mineralogical Magazine 60:787-793.; Rocks & Minerals 84:492-500
  • South Dakota
    • Lawrence Co.
      • Bald Mountain District
Mineral Webzine, Dec. 2001
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2018, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: March 21, 2018 11:03:17 Page generated: January 24, 2018 18:57:27
Go to top of page