Meurigite-K Mineral Data

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General Meurigite-K Information

Chemical Formula:

[K(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]

Composition:

Molecular Weight = 1,258.57 gm

Potassium 2.83 % K 3.41 % K₂O

Sodium 0.05 % Na 0.07 % Na₂O

Aluminum 0.36 % Al 0.69 % Al₂O₃

Iron 33.37 % Fe 47.71 % Fe₂O₃

Copper 0.15 % Cu 0.19 % CuO

Phosphorus 13.49 % P 30.90 % P₂O₅

Hydrogen 1.82 % H 16.30 % H₂O

Carbon 0.20 % C 0.73 % CO₂

Oxygen 47.72 % O

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

K_0.91Na_0.03(H₂O)_2.56Fe³⁺_7.52Al_0.17Cu_0.03(PO₄)_5.48(CO₃)_0.21(OH)_7.2(H₂O)_5.23

Environment:

Renamed 2007 to meurigite-K because of the approval of meuigite-Na (2007)

IMA Status:

Approved IMA 1995 (Dana # Added), Renamed IMA 2007

Locality:

Santa Rita copper mine at Silver City, New Mexico, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Sir John Meurig Thomas, British chemist and potassium in formula.

Name Pronunciation:

Meurigite-K + Pronunciation

Synonym:

IMA1995-022

Meurigite

Meurigite-K Image

Images:

Meurigite-K

Comments: Brown meuirite-K oolite showing the concentric-fibrous internal structure.
Location: Rengersdorf, Görlitz, Oberlausitz, Saxony, Germany. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Meurigite-K

Comments: Yellow, radial acicular sprays of meurigite to about 0.75 mm.
Location: Teskov quarry, near Prague, Bohemia, Czech Republic. Scale: Picture size 1.5 cm.
© Tom Loomis / Dakota Matrix

Images:

Meurigite-K

Comments: Yellow-green spheroidal crystals of meurigite to 0.1mm, in a 5mm vug in black rockbridgeite(?) matrix.
Location: Hagendorf Sud Pegmatite, Oberpfalz, Bavaria, Germany. Scale: Picture size 1.2 cm.
© Tom Loomis / Dakota Matrix

Meurigite-K Crystallography

Axial Ratios:

a:b:c =5.5922:1:3.7955

Cell Dimensions:

a = 29.018, b = 5.189, c = 19.695, Z = 4; beta = 106.987° V = 2,836.18 Den(Calc)= 2.95

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.216(1), 4.84(0.9), 3.116(0.8),

Crystal Structure:

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Kampf A R , Pluth J J , Chen Y S , American Mineralogist , 92 (2007) p.1518-1524, The crystal structure of meurigite, Locality: Santa Rita mine, Grant County, New Mexico

Physical Properties of Meurigite-K

Cleavage:

{001} Good

Color:

White, Cream, Yellowish brown, Pale yellow, Canary yellow.

Density:

2.96

Diaphaneity:

Translucent

Habit:

Spherical - Spherical, rounded aggregates.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luster:

Silky

Streak:

pale yellowish white

Optical Properties of Meurigite-K

Gladstone-Dale:

CI meas= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2672,KPDmeas= 0.2663,KC= 0.2724
Ncalc = 1.8 - 1.81

Optical Data:

Biaxial (+), a=1.78, b=1.785, g=1.8, bire=0.0200

Calculated Properties of Meurigite-K

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Meurigite-K =2.95 gm/cc.

Fermion Index:

Fermion Index = 0.0073314294
Boson Index = 0.9926685706

Photoelectric:

PE_Meurigite-K= 10.88 barns/electron
U=PE_Meurigite-K x r_electron= 31.75 barns/cc.

Radioactivity:

GRapi = 40.39 (Gamma Ray American Petroleum Institute Units)
Concentration of Meurigite-K per GRapi unit = 2.48 (%)

Estimated Radioactivity from Meurigite-K - barely detectable

Meurigite-K Classification

Dana Class:

42.12.06.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.12)with miscellaneous formulae

(42.12.06)Meurigite group

42.12.06.01 Meurigite-K! [K(H2O)2.5][Fe8(PO4)6(OH)7(H2O)4] C 2/c 2/m

42.12.06.02 Meurigite-Na! [Na(H2O)2.5][Fe8(PO4)6(OH)7(H2O)4] C 2/c 2/m

Strunz Class:

08.DJ.20 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DJ -With large and medium-sized cations, (OH, etc.):RO4 = 1:l

08.DJ.20 Meurigite-K! [K(H2O)2.5][Fe8(PO4)6(OH)7(H2O)4] C 2/c 2/m

08.DJ.20 Phosphofibrite KCuFe15(PO4)12(OH)12•12(H2O) Pbmn,Pnmn 2/m 2/m 2/m

08.DJ.20 Meurigite-Na! [Na(H2O)2.5][Fe8(PO4)6(OH)7(H2O)4] C 2/c 2/m

Other Meurigite-K Information

References:

NAME( Lapis) PHYS. PROP.(Min.Mag.,60:787, AmMin v92:1518) OPTIC PROP.(Min.Mag.,Vol.60,p787,1996)

See Also:

Links to other databases for Meurigite-K :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Meurigite-K

[K(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]
Dana No: 42.12.06.01 Strunz No: 08.DJ.20
Locality:

Notes: