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Osakaite
A valid IMA mineral species
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About Osakaite
Formula:
Zn4(SO4)(OH)6 · 5H2O
Colour:
Pale blue to colorless or white
Lustre:
Pearly
Hardness:
1
Specific Gravity:
2.70
Crystal System:
Triclinic
Member of:
Name:
Named for Osaka prefecture, Japan, that includes the type locality.
Type Locality:
Known as a synthetic compound (Bear, 1986).
Partial dehydration may result in lahnsteinite.
Related to namuwite.
Compare also Unnamed (Basic Zinc Sulphate Hydrate).
Partial dehydration may result in lahnsteinite.
Related to namuwite.
Compare also Unnamed (Basic Zinc Sulphate Hydrate).
Unique Identifiers
Mindat ID:
31498
Long-form identifier:
mindat:1:1:31498:1
Classification of Osakaite
Gordaite-type sheet
Members of the namuwite group exhibit gordaite-type sheets.
IMA Classification of Osakaite
Approved
IMA Formula:
Zn2+4S6+O4(OH)6(H2O)·4H2O
Approval year:
2006
First published:
2007
Type description reference:
7.DE.40
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
31.4.7.2
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
4 : (AB)4(XO4)Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
4 : (AB)4(XO4)Zq·xH2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ok | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Osakaite
Pearly
Transparency:
Transparent
Colour:
Pale blue to colorless or white
Streak:
White to pale blue
Hardness:
1 on Mohs scale
Hardness:
VHN10=16.5 - 22.8 kg/mm2 - Vickers
Tenacity:
Flexible
Cleavage:
Perfect
{001}
{001}
Density:
2.70(2) g/cm3 (Measured) 2.75 g/cm3 (Calculated)
Optical Data of Osakaite
Type:
Biaxial (-)
RI values:
nα = 1.532(2) nβ = 1.565(2) nγ = 1.567(2)
2V:
Calculated: 27.2°
Max. Birefringence:
δ = 0.035
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Low (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Chemistry of Osakaite
Mindat Formula:
Zn4(SO4)(OH)6 · 5H2O
Element Weights:
Elements listed:
Crystallography of Osakaite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.358 Å, b = 8.337 Å, c = 11.027 Å
α = 94.97°, β = 83.16°, γ = 119.6°
α = 94.97°, β = 83.16°, γ = 119.6°
Ratio:
a:b:c = 1.003 : 1 : 1.323
Unit Cell V:
663 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.96 Å | (100) |
| 5.47 Å | (16) |
| 3.642 Å | (17) |
| 3.229 Å | (8) |
| 2.717 Å | (21) |
| 2.663 Å | (8) |
| 2.562 Å | (9) |
| 1.574 Å | (18) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] |
Type Occurrence of Osakaite
General Appearance of Type Material:
Pale blue to colorless platy crystals
Place of Conservation of Type Material:
National Science Museum, Tokyo, number NSM-M28983.
Geological Setting of Type Material:
Oxide zone of hydrothermal vein cutting shale at abandoned zinc mine.
Associated Minerals at Type Locality:
Synonyms of Osakaite
Other Language Names for Osakaite
Relationship of Osakaite to other Species
Member of:
Other Members of Namuwite Group:
| Bechererite | Zn7Cu(OH)13[(SiO(OH)3(SO4)] | Trig. 3 : P3 |
| Gordaite | NaZn4(SO4)(OH)6Cl · 6H2O | Trig. 3 : P3 |
| Guarinoite | Zn6(SO4)(OH)10 · 5H2O | Hex. |
| Hanahanite | [Zn8(OH)14(SO4)] · 3H2O | Hex. 6 : P63 |
| Haywoodite | [Pb(H2O)10][Zn12(OH)20(H2O)(SO4)3] | Tric. 1 : P1 |
| Hodgesmithite | (Cu,Zn)6Zn(SO4)2(OH)10 · 3H2O | Trig. 3 : P3 |
| Lahnsteinite | Zn4(SO4)(OH)6 · 3H2O | Tric. 1 : P1 |
| Namuwite | Zn4(SO4)(OH)6 · 4H2O | Trig. 3 : P3 |
| Ramsbeckite | (Cu,Zn)15(SO4)4(OH)22 · 6H2O | Mon. 2/m |
| Thérèsemagnanite | NaCo4(SO4)(OH)6Cl · 6H2O | Trig. 3 : P3 |
| Tzeferisite | CaZn8(SO4)2(OH)12Cl2(H2O)9 | Trig. 3m(32/m) : R3c |
Common Associates
Associations Based on Photo Data:
| 2 photos of Osakaite associated with Lahnsteinite | Zn4(SO4)(OH)6 · 3H2O |
| 1 photo of Osakaite associated with Serpierite | Ca(Cu2+,Zn2+)4(S6+O4)2(OH)6 · 3H2O |
| 1 photo of Osakaite associated with Namuwite | Zn4(SO4)(OH)6 · 4H2O |
Related Minerals - Strunz-mindat Grouping
| 7.DE. | Magnesioalterite | Mg2Fe3+4(SO4)4(C2O4)2(OH)4 · 17H2O |
| 7.DE. | Fabritzite | Zn9(SO4)2(OH)12Cl2 · 6H2O |
| 7.DE. | Cossaite | (Mg0.5,◻)Al6(SO4)6(HSO4)F6 · 36H2O |
| 7.DE. | Downsite | K2(MoO3)3(SO4) · 4H2O |
| 7.DE. | Liangjunite | K2(Mo2O5)(SO4)2 · 3H2O |
| 7.DE.05 | Mangazeite | Al2(SO4)(OH)4 · 3H2O |
| 7.DE.10 | 'UKI-1975-(SO:AlCu)' | (Cu, Al, SO4, H2O) |
| 7.DE.10 | Carbonatecyanotrichite | Cu4Al2(CO3,SO4)(OH)12 · 2H2O |
| 7.DE.10 | Cyanotrichite | Cu4Al2(SO4)(OH)12 · 2H2O |
| 7.DE.15 | Schwertmannite | Fe3+16(OH,SO4)12-13O16 · 10-12H2O |
| 7.DE.20 | Tlalocite | Cu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl · 27H2O |
| 7.DE.25 | Utahite | MgCu4Zn2Te6+3O14(OH)4 · 6H2O |
| 7.DE.35 | Coquandite | Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3) |
| 7.DE.42 | Alterite | Zn2Fe3+4(SO4)4(C2O4)2(OH)4 · 17H2O |
| 7.DE.45 | Barrotite | Cu9Al(HSiO4)2[(SO4)(HAsO4)0.5](OH)12 · 8H2O |
| 7.DE.45 | Wilcoxite | MgAl(SO4)2F · 17H2O |
| 7.DE.47 | Tiberiobardiite | {Cu9Al[SiO3(OH)]2(OH)12(H2O)6}(SO4)1.5 · 10H2O |
| 7.DE.50 | Bouškaite | (MoO2)2O(SO3OH)2(H2O)4 |
| 7.DE.50 | Stanleyite | (V4+O)(SO4) · 6H2O |
| 7.DE.57 | 'Khangalasite' | Fe(SO4)(OH) · 2H2O |
| 7.DE.60 | Hydrobasaluminite | Al4(SO4)(OH)10 · 12-36H2O |
| 7.DE.62 | Volaschioite | Fe4(SO4)O2(OH)6 · 2H2O |
| 7.DE.65 | Zaherite | Al12(SO4)5(OH)26 · 20H2O |
| 7.DE.75 | Camérolaite | Cu6Al3(OH)18(H2O)2[Sb(OH)6](SO4) |
Fluorescence of Osakaite
None
Other Information
Notes:
Easily soluble in dilute HCl and HNO3
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Osakaite
mindat.org URL:
https://www.mindat.org/min-31498.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Osakaite
Reference List:
Bear, I. J., Grey, I. E., Madsen, I. C., Newnham, I. E., Rogers, L. J. (1986) Structures of the basic zinc sulfates 3Zn(OH)2.ZnSO4.mH2O, m = 3 and 5. Acta Crystallographica Section B Structural Science, 42 (1) 32-39 doi:10.1107/s0108768186098622
Localities for Osakaite
Showing 16 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| Elliott (2010) |
Bulgaria | |
| Petrov et al. (2022) |
Germany | |
| Gerhard Möhn collection +2 other references |
| Gerhard Möhn Collection Analyzed by ... |
| Witzke (2024) |
Greece | |
| Lapis (2008) |
| Kolitsch et al. (2014) |
| Kolitsch et al. (2014) | |
| Rieck (n.d.) |
Italy | |
| Lecca et al. (2022) |
| Orlandi (2013) |
| Orlandi (2013) | |
| Orlandi (2013) |
Japan (TL) | |
| Ohnishi et al. (2007) +1 other reference |
USA | |
| Kampf et al. (2016) +1 other reference |
| Anthony Kampf PXRD and EDS analysis. ... |
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Santa Rosa Mine, Malpais Mesa, Inyo Mts, Inyo County, California, USA