Honzaite
A valid IMA mineral species
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About Honzaite
Jan “Honza” Hloušek
Formula:
Ni2(AsO3OH)2 · 5H2O
Colour:
Pale pink (some with purplish or violet tints); pale greenish
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.993 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Dr. Jan “Honza” Hloušek (10 March 1950, Karlovy Vary, Czechoslovakia – 27 April 2014, Jáchymov, Czech Republic), prominent mineralogist and famous collector of minerals from the Jáchymov ore district. He co-described eight new minerals and wrote a two volume book entitled Jachymov-Joachimsthal. The species hloušekite is also named after him.
Isostructural with:
Unique Identifiers
Mindat ID:
46610
Long-form identifier:
mindat:1:1:46610:5
Similar Names
IMA Classification of Honzaite
Approved
IMA Formula:
Ni2+2[As5+O3(OH)]2(H2O)5
Approval year:
2015
First published:
2018
Classification of Honzaite
8.CB.X
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
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 |
|---|---|---|
| Hzt | 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 Honzaite
Vitreous
Colour:
Pale pink (some with purplish or violet tints); pale greenish
Comment:
Pinkish colour is due to high Co contents.
Streak:
Pale pink
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{0 1 0}
{0 1 0}
Fracture:
Irregular/Uneven
Density:
2.993 g/cm3 (Calculated)
Optical Data of Honzaite
Type:
Biaxial (+)
RI values:
nα = 1.601(2) nβ = 1.608(2) nγ = 1.629(2)
2V:
Measured: 60° (1)
Max. Birefringence:
δ = 0.028
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:
High (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 Honzaite
Mindat Formula:
Ni2(AsO3OH)2 · 5H2O
Element Weights:
Elements listed:
Crystallography of Honzaite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 4.6736(6) Å, b = 9.296(1) Å, c = 12.592(1) Å
β = 99.115(8)°
β = 99.115(8)°
Ratio:
a:b:c = 0.503 : 1 : 1.355
Unit Cell V:
540.2 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.431 Å | (100) |
| 6.215 Å | (18) |
| 3.717 Å | (9) |
| 3.360 Å | (3) |
| 3.254 Å | (7) |
| 3.078 Å | (7) |
| 3.005 Å | (5) |
| 2.568 Å | (7) |
Reference:
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Honzaite
General Appearance of Type Material:
Irregular to hemispherical microcrystalline aggregates up to 5mm in diameter on strongly weathered ore gangue. Tiny prismatic crystals, up to 30 μm long, are rarely observed on the surface of the aggregates.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Department of Mineralogy and Petrology, National Museum of Prague, Prague, Czech Republic, catalogue number P1N 38.099
Empirical Formula of Type Material:
(Ni1.08Co0.83Zn0.05Cu0.03Mg0.03Fe0.01Ca0.01)Σ20.04(AsO3OH)1.94SO4)0.03(PO3OH)0.02·5H2O
Chemical Analysis of Type Material:
| MgO | 0.24 % |
|---|---|
| CaO | 0.10 % |
| FeO | 0.21 % |
| NiO | 16.51 % |
| CoO | 12.71 % |
| CuO | 0.55 % |
| ZnO | 0.84 % |
| P2O5 | 0.26 % |
| As2O5 | 45.82 % |
| SO3 | 0.52 % |
| H2O (calc.) | 22.15 % |
| Total: | 99.91 % |
Geological Setting of Type Material:
It forms during weathering of primary nickelskutterudite and tennantite under strongly acidic conditions.
Synonyms of Honzaite
Other Language Names for Honzaite
Related Minerals - Strunz-mindat Grouping
| 8.CB. | Krupičkaite | Cu6[AsO3(OH)]6 · 8H2O |
| 8.CB.X | Redondite | AlPO4 · 2H2O |
| 8.CB.05 | Ermeloite | Al(PO4) · H2O |
| 8.CB.05 | Serrabrancaite | MnPO4 · H2O |
| 8.CB.10 | Nyholmite | Cd3Zn2(AsO3OH)2(AsO4)2 · 4H2O |
| 8.CB.10 | Villyaellenite | (Mn,Ca)Mn2Ca2(AsO3OH)2(AsO4)2 · 4H2O |
| 8.CB.10 | Giftgrubeite | CaMn2Ca2(AsO4)2(AsO3OH)2 · 4H2O |
| 8.CB.10 | Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
| 8.CB.10 | Miguelromeroite | Mn2+5(AsO3OH)2(AsO4)2(H2O)4 |
| 8.CB.10 | 'UM1997-09-AsO:CaHMgZn' | (Mg,Ca,Zn)5(AsO4)2(HAsO4)2 · 4H2O |
| 8.CB.15 | Krautite | Mn(HAsO4) · H2O |
| 8.CB.20 | Cobaltkoritnigite | Co(AsO3OH) · H2O |
| 8.CB.20 | Magnesiokoritnigite | Mg(AsO3OH) · H2O |
| 8.CB.20 | Koritnigite | Zn(AsO3OH) · H2O |
| 8.CB.25 | Yvonite | Cu(HAsO4) · 2H2O |
| 8.CB.30 | Geminite | Cu2+(AsO3OH) · H2O |
| 8.CB.35 | Schubnelite | Fe3+VO4 · H2O |
| 8.CB.40 | Radovanite | Cu2Fe3+(AsO4)(HAs3+O3)2 · H2O |
| 8.CB.45 | Kazakhstanite | Fe3+5V4+3V5+12O39(OH)9 · 9H2O |
| 8.CB.50 | Kolovratite | NixZny(VO4)0.67(x+y) · nH2O |
| 8.CB.60 | Burgessite | Co2(H2O)4[AsO3(OH)]2(H2O) |
| 8.CB.65 | Cardite | Zn5.5(AsO4)2(AsO3OH)(OH)3 · 3H2O |
Fluorescence of Honzaite
does not fluoresce under either short- or long-wave ultraviolet light
Other Information
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 Honzaite
mindat.org URL:
https://www.mindat.org/min-46610.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Honzaite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 25. Mineralogical Magazine, 79 (3) 529-535 doi:10.1180/minmag.2015.079.3.02
Localities for Honzaite
Showing 3 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.
Czech Republic (TL) | |
| Sejkora et al. (2018) |
Germany | |
| Motzigemba et al. (09/2023) |
Italy | |
| Gianluca Armellino |
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Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic