Munakataite Mineral Data

General Munakataite Information

Chemical Formula:

Pb2Cu2(Se++++O3)(SO4)(OH)4

Composition:

Molecular Weight = 835.91 gm

Calcium 0.05 % Ca 0.07 % CaO

Copper 14.75 % Cu 18.46 % CuO

Hydrogen 0.47 % H 4.22 % H₂O

Lead 50.32 % Pb 52.26 % Pb₂O

Selenium 9.45 % Se 13.27 % SeO₂

Sulfur 3.91 % S 9.77 % SO₃

Oxygen 21.05 % O

______ ______

100.00 % 98.06 % = TOTAL OXIDE

Empirical Formula:

Pb_2.03Cu_1.94Ca_0.01(SeO₃)(SO₄)_1.02(OH)_3.92

Environment:

Occurs as a thin coating on a fracture in quartz veins. Linarite-chenite group

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Kato mine, Munakata City, Fukuoka Prefecture, Japan Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2007-012

Munakataite Image

Images:

Munakataite

Comments: Light blue fiberous crystals of munakataite with green malachite. (Journal Mineralogical and Petrological Sci., v103:327).
Location: Kato mine, Munakata City, Fukuoka Prefecture, Japan. Scale: Picture size 1.8 mm.
© Journal of Mineralogical and Petrological Sciences

Munakataite Crystallography

Axial Ratios:

a:b:c =1.7236:1:1.6397

Cell Dimensions:

a = 9.766, b = 5.666, c = 9.291, Z = 2; beta = 102.4° V = 502.12 Den(Calc)= 5.53

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 3.18(1), 3.14(0.68), 4.47(0.57),4.86(0.44), 3.53(0.39), 2.72(0.22), 1.813(0.19), 2.33(0.18),

Physical Properties of Munakataite

Cleavage:

{h0l} Perfect

Color:

Light blue.

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

1.5 - Between Talc and Gypsum

Luster:

Vitreous - Pearly

Streak:

bluish white

Optical Properties of Munakataite

Gladstone-Dale:

CI calc= -0.809 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1611,KC= 0.0891
Ncalc = 1.49

Optical Data:

Biaxial (?), b=1.891

Calculated Properties of Munakataite

Electron Density:

Bulk Density (Electron Density)=4.83 gm/cc
note: Specific Gravity of Munakataite =5.53 gm/cc.

Fermion Index:

Fermion Index = 0.11
Boson Index = 0.89

Photoelectric:

PE_Munakataite= 899.12 barns/electron
U=PE_Munakataite x rElectron Density=4,344.08 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Munakataite is Not Radioactive

Munakataite Classification

Dana Class:

33.01.01.02 (33)Selenates and Tellurates

(33.01)as A+ (B++)m XO4 Zq

(33.01.01)Schmiederite Series

33.01.01.01 Schmiederite Pb2Cu2(SeO3)(SeO4)(OH)4 P 2₁/m 2/m

33.01.01.02 Munakataite! Pb2Cu2(SeO3)(SO4)(OH)4 P 2₁/m 2/m

Strunz Class:

07.BC.65 07 - SULFATES (SELENATES, TELLURATES)

07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O

07.BC -With medium-sized and large cations

07.BC.65 Linarite PbCu(SO4)(OH)2 P 2₁/m 2/m

07.BC.65 Schmiederite Pb2Cu2(SeO3)(SeO4)(OH)4 P 2₁/m 2/m

07.BC.65 Munakataite! Pb2Cu2(SeO3)(SO4)(OH)4 P 2₁/m 2/m

Other Munakataite Information

References:

NAME( Journal Mineralogical and Petrological Sci., v103:327) PHYS. PROP.(Journal Mineralogical and Petrological Sci., v103:327) OPTIC PROP.(Journal Mineralogical and PetrologicalSci.,

See Also:

Links to other databases for Munakataite :
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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Munakataite

Pb2Cu2(Se++++O3)(SO4)(OH)4
Dana No: 33.01.01.02 Strunz No: 07.BC.65
Locality:

Notes:

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