Osakaite Mineral Data

General Osakaite Information

Chemical Formula:

Zn4SO4(OH)6•5H2O

Composition:

Molecular Weight = 548.75 gm

Zinc 44.69 % Zn 55.62 % ZnO

Copper 2.78 % Cu 3.48 % CuO

Hydrogen 2.93 % H 26.17 % H₂O

Sulfur 5.90 % S 14.74 % SO₃

Oxygen 43.71 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn_3.75Cu_0.24(SO₄)_1.01(OH)_5.96•4.99(H₂O)

Environment:

Found in gallery walls and in cracks in Jurassic shales (Cu, Zn, Pb, Fe, and Mn deposits). New structure type. Dehydrates to namuwite.

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Hirao mine, Minoo (Minoh) City, Osaka Prefecture, Japan Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

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Osakaite Crystallography

Axial Ratios:

a:b:c =1.0025:1:1.3226

Cell Dimensions:

a = 8.358, b = 8.337, c = 11.027, Z = 2; alpha = 94.97°, beta = 83.16°, gamma = 119.6° V = 660.84 Den(Calc)= 2.76

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 10.96(1), 2.562(0.9), 2.663(0.8),3.229(0.8), 2.717(0.21), 1.574(0.18), 3.642(0.17), 5.47(0.16),

Physical Properties of Osakaite

Cleavage:

{001} Perfect

Color:

White, Pale blue.

Density:

2.7

Fracture:

Flexible - Flexible fragments.

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).

Hardness:

1 - Talc

Luster:

Vitreous (Glassy)

Streak:

white or pale blue

Optical Properties of Osakaite

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2017,KPDmeas= 0.2054,KC= 0.2088
Ncalc = 1.56 - 1.57

Optical Data:

Biaxial (-), a=1.532, b=1.565, g=1.567, bire=0.0350

Calculated Properties of Osakaite

Electron Density:

Bulk Density (Electron Density)=2.67 gm/cc
note: Specific Gravity of Osakaite =2.70 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Osakaite= 23.22 barns/electron
U=PE_Osakaite x rElectron Density= 62.05 barns/cc.

Radioactivity:

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

Osakaite Classification

Dana Class:

31.01.06.03 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.01)where (A+ B++)m (XO4)p Zq·x(H2O), where m:p>6:1

(31.01.06)Schulenbergite group

31.01.06.01 Schulenbergite (Cu,Zn)7(SO4,CO3)2(OH)10•3(H2O) Hex Hex

31.01.06.02 Bechererite! (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2 P 3 3

31.01.06.03 Osakaite! Zn4SO4(OH)6•5H2O P1 1

31.01.06.04 Zn-Schulenbergite! (Zn,Cu)7(SO4,CO3)2(OH)10•3(H2O) Hex Hex

Strunz Class:

07.DE.40 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DE -With only medium-sized cations; unclassified

07.DE.40 Osakaite! Zn4SO4(OH)6•5H2O P1 1

Other Osakaite Information

References:

NAME( AmMin, v93:1688) PHYS. PROP.(AmMin, v93:1688) OPTIC PROP.(AmMin, v93:1688)

See Also:

Links to other databases for Osakaite :
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 Osakaite Specimen Label here :

Osakaite

Zn4SO4(OH)6•5H2O
Dana No: 31.01.06.03 Strunz No: 07.DE.40
Locality:

Notes: