Mrázekite
A valid IMA mineral species
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About Mrázekite
Zdeněk Mrázek
Formula:
Bi2Cu3(PO4)2O2(OH)2 · H2O
Colour:
Cerulean blue, dark blue
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
4.90
Crystal System:
Monoclinic
Name:
Named by T. Rídkošil, V. Šrein, J. Fábry, J. Hybler, and B.A. Maximov in 1992 in honor of Zdeněk Mrázek (15 February 1952 - 15 April 1984), a Czech mineralogist who first collected the species and suspected it was new.
This page provides mineralogical data about Mrázekite.
Name Encoding
ASCII-7:
Mrazekite
Unique Identifiers
Mindat ID:
2801
Long-form identifier:
mindat:1:1:2801:7
Similar Names
| Murasakite | A synonym of 'Piedmontite-quartz schist' |
IMA Classification of Mrázekite
Approved
IMA Formula:
Bi3+2Cu2+3(PO4)2O2(OH)2·2H2O
Approval year:
1990
First published:
1992
Classification of Mrázekite
8.DJ.40
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1
42.4.15.1
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq·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 |
|---|---|---|
| Mrz | 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 Mrázekite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Cerulean blue, dark blue
Streak:
Light blue
Hardness:
2 - 3 on Mohs scale
Cleavage:
Distinct/Good
201
201
Density:
4.90(2) g/cm3 (Measured) 5.00 g/cm3 (Calculated)
Optical Data of Mrázekite
Type:
Biaxial (-)
RI values:
nα = 1.8 nβ = 1.86 - 1.87 nγ = 1.9
2V:
Measured: 66° to 68°
Max. Birefringence:
δ = 0.100
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:
Very 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.
Dispersion:
r < v strong
Pleochroism:
Weak
Comments:
in ink blue tints
Chemistry of Mrázekite
Mindat Formula:
Bi2Cu3(PO4)2O2(OH)2 · H2O
Element Weights:
Crystallography of Mrázekite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 9.065(1) Å, b = 6.340(1) Å, c = 5.410(3) Å
β = 101.57(1)°
β = 101.57(1)°
Ratio:
a:b:c = 1.43 : 1 : 0.853
Unit Cell V:
304.61 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Acicular to slender bladed crystals. Wedge-like terminations, rosettes or spherules of radial acicular crystals, crusts.
Comment:
Space Group: P21/n.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.630 Å | (100) |
| 6.089 Å | (42) |
| 5.407 Å | (56) |
| 5.198 Å | (46) |
| 5.146 Å | (49) |
| 3.637 Å | (35) |
| 3.170 Å | (35) |
| 3.042 Å | (87) |
| 3.016 Å | (77) |
| 2.927 Å | (76) |
Comments:
Only peaks >30% of max. Data from Effenberger, et al. 1994.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Geological Setting:
Oxidized zone of polymetallic sulfide deposits.
Type Occurrence of Mrázekite
General Appearance of Type Material:
Slender needles isolated or loosely grouped as small rosettes in a quartz matrix.
Place of Conservation of Type Material:
Charles University, Prague
Geological Setting of Type Material:
Oxidation zone of an ore deposit containing chalcopyrite, tetrahedrite, psuedomalachite, apatite and an unknown primary bismuth mineral.
Associated Minerals at Type Locality:
Synonyms of Mrázekite
Other Language Names for Mrázekite
Common Associates
Associations Based on Photo Data:
| 18 photos of Mrázekite associated with Quartz | SiO2 |
| 18 photos of Mrázekite associated with Eulytine | Bi4(SiO4)3 |
| 8 photos of Mrázekite associated with Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| 7 photos of Mrázekite associated with Emplectite | CuBiS2 |
| 3 photos of Mrázekite associated with Bismutite | (BiO)2CO3 |
| 2 photos of Mrázekite associated with Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| 2 photos of Mrázekite associated with Pseudomalachite | Cu5(PO4)2(OH)4 |
| 1 photo of Mrázekite associated with 'Opal-AN' | SiO2 · nH2O |
| 1 photo of Mrázekite associated with Grossular | Ca3Al2(SiO4)3 |
| 1 photo of Mrázekite associated with Opal | SiO2 · nH2O |
Related Minerals - Strunz-mindat Grouping
| 8.DJ.05 | Johnwalkite | K(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH) |
| 8.DJ.05 | Olmsteadite | KFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2O |
| 8.DJ.10 | Gatumbaite | CaAl2(PO4)2(OH)2 · H2O |
| 8.DJ.15 | Camgasite | CaMg(AsO4)(OH) · 5H2O |
| 8.DJ.20 | Meurigite-K | KFe3+8(PO4)6(OH)7 · 6.5H2O |
| 8.DJ.20 | Phosphofibrite | (H2O,K)3.5Fe8(PO4)6(OH)7 · 5H2O |
| 8.DJ.20 | Meurigite-Na | NaFe3+8(PO4)6(OH)7 · 6.5H2O |
| 8.DJ.25 | Jungite | Ca2Zn4Fe3+8(PO4)9(OH)9 · 16H2O |
| 8.DJ.30 | Wycheproofite | NaAlZr(PO4)2(OH) · H2O |
| 8.DJ.35 | Ercitite | Na2Mn3+2(PO4)2(OH)2 · 4H2O |
| 8.DJ.45 | Attikaite | Ca3Cu2Al2(AsO4)4(OH)4 · 2H2O |
| 8.DJ.50 | Mengeite | Ba(Mg,Mn2+)Mn3+4(PO4)4(OH)4 · 4H2O |
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 Mrázekite
mindat.org URL:
https://www.mindat.org/min-2801.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Mrázekite
Reference List:
Rídkošil, T., Šrein, V., Fábry, J., Hybler, J., Maximov, B.A. (1992) Mrázekite, Bi2Cu3(OH)2O2(PO4)2·2H2O. The Canadian Mineralogist, 30 (1). 215-224
Effenberger, H., Krause, W., Belendorff, K., Bernhardt, H.J., Medenbach, O., Hybler, J., Petříček, V. (1994) Revision of the crystal structure of mrázekite, Bi2Cu3(OH)2O2(PO4)2·2H2O. The Canadian Mineralogist, 32 (2). 365-372
Localities for Mrázekite
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 | |
| Dunning et al. (1998) +1 other reference |
Czech Republic | |
| P.Pauliš |
| Sejkora et al. (2021) | |
| Hloušek et al. (2002) | |
France | |
| De Bondt (n.d.) |
| Chiappero et al. (1995) +1 other reference |
Germany | |
| Confirmed by Uwe Kolitsch |
| |
| |
| Witzke et al. (2001) |
Portugal | |
| Menor-Salván (2012) |
Romania | |
| |
Slovakia (TL) | |
| Rídkošil et al. (1992) |
| Števko M. et al. (Slovenská republika) +1 other reference | |
Spain | |
| Steffen Michalski Collection |
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Bismuth vein, Fréland, Colmar-Ribeauvillé, Haut-Rhin, Grand Est, France