Meurigite-Na Mineral Data

General Meurigite-Na Information

Chemical Formula:

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

Composition:

Molecular Weight = 1,239.22 gm

Potassium 0.28 % K 0.34 % K₂O

Sodium 1.60 % Na 2.15 % Na₂O

Calcium 0.16 % Ca 0.23 % CaO

Magnesium 0.02 % Mg 0.03 % MgO

Aluminum 2.87 % Al 5.43 % Al₂O₃

Vanadium 0.49 % V 0.88 % V₂O₅

Iron 29.88 % Fe 42.72 % Fe₂O₃

Copper 0.21 % Cu 0.26 % CuO

Phosphorus 14.40 % P 32.99 % P₂O₅

Hydrogen 1.68 % H 14.97 % H₂O

Oxygen 48.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na_0.86K_0.09Ca_0.05(H₂O)_1.9(H₃O)_0.6Fe³⁺_6.63Al_1.32Cu_0.04Mg_0.016(P_0.96)6(V⁵⁺_0.02)6(O₄) (OH)₇·4(H₂O)

Environment:

Occurs very late in a paragenetic sequence of secondary minerals in a sulfide mine. Meurigite group.

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, USA. Link to MinDat.org Location Data.

Name Origin:

Named as the Na analog of meurigite-K.

Name Pronunciation:

Meurigite-Na + Pronunciation

Synonym:

IMA2007-024

Meurigite-Na Image

Images:

Meurigite-Na

Comments: B&W image of sprays of meurigite-Na with turquoise, intergrown kidwellite/lipscombite, and crandallite on goethite. (AmMin, v94:720).
Location: Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, USA. Scale: Largest Spray = 1 mm.
© American Mineralogist

Images:

Meurigite-Na

Comments: SEM image of meurigite-Na crystals. (AmMin, v94:720).
Location: Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, USA. Scale: See Image.
© American Mineralogist

Images:

Meurigite-Na

Comments: Pale pearly yellow platy Meurigite-Na crystals all over vuggy matrix.
Location: Tom's Phosphate quarry, Kapunda, South Australia, Australia. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Meurigite-Na Crystallography

Axial Ratios:

a:b:c =5.5614:1:3.7579

Cell Dimensions:

a = 28.835, b = 5.1848, c = 19.484, Z = 4; beta = 106.983° V = 2,785.90 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): 9.349(1), 3.206(0.4), 3.107(0.3),1.574(0.2), 4.318(0.2), 4.843(0.2), 13.8(0.2), 2.971(0.15),

Physical Properties of Meurigite-Na

Cleavage:

{001} Distinct

Color:

Cream, Pale yellow.

Density:

2.94

Diaphaneity:

Transparent

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3 - Calcite

Luster:

Silky

Streak:

white

Optical Properties of Meurigite-Na

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2556,KPDmeas= 0.2565,KC= 0.2658
Ncalc = 1.78

Optical Data:

Biaxial (-), a=1.74, b=1.759, g=1.763, bire=0.0230, 2V(Calc)=48, 2V(Meas)=50. Dispersion dispersion not observed.

Calculated Properties of Meurigite-Na

Electron Density:

Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Meurigite-Na =2.94 gm/cc.

Fermion Index:

Fermion Index = 0.0066036942
Boson Index = 0.9933963058

Photoelectric:

PE_Meurigite-Na= 9.87 barns/electron
U=PE_Meurigite-Na x r_electron= 28.70 barns/cc.

Radioactivity:

GRapi = 4.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Meurigite-Na per GRapi unit = 24.69 (%)

Estimated Radioactivity from Meurigite-Na - barely detectable

Meurigite-Na Classification

Dana Class:

42.12.06.02 (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-Na Information

References:

NAME( AmMin, v94:720) PHYS. PROP.(AmMin, v94:720) OPTIC PROP.(AmMin, v94:720)

See Also:

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

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Print or Cut-and-Paste your Meurigite-Na Specimen Label here :

Meurigite-Na

[Na(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]
Dana No: 42.12.06.02 Strunz No: 08.DJ.20
Locality:

Notes: