Švenekite
A valid IMA mineral species
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About Švenekite
Jaroslav Švenek
Formula:
Ca(H2AsO4)2
Colour:
Colourless, white
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
3.16
Crystal System:
Triclinic
Name:
Named in honour of Jaroslav Švenek (1927-1994), the former curator of the mineralogical collection of the National Museum in Prague, Czech Republic.
Well-known as a synthetic compound.
Name Encoding
Latin-1:
Svenekite
ASCII-7:
Svenekite
Unique Identifiers
Mindat ID:
7076
Long-form identifier:
mindat:1:1:7076:4
IMA Classification of Švenekite
Approved
IMA Formula:
Ca(As5+O2(OH)2)2
Approval year:
1999
First published:
2013
Type description reference:
Ondruš, P., Skála, R., Plášil, J., Sejkora, J., Veselovský, F., Čejka, J., Kallistová, A., Hloušek, J., Fejfarová, K., Škoda, R., Dušek, M., Gabašová, A., Machovič, V., Lapčák, L. (2013) Švenekite, Ca[AsO2(OH)2]2, a new mineral from Jáchymov, Czech Republic. Mineralogical Magazine, 77 (6) 2711-2724 doi:10.1180/minmag.2013.077.6.02
Classification of Švenekite
8.AD.10
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 7th ed.:
37.1.6.1
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 |
|---|---|---|
| Švn | 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 Švenekite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless, white
Streak:
White
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Very Good
very good cleavage on {010}
very good cleavage on {010}
Fracture:
Irregular/Uneven
Density:
3.16(1) g/cm3 (Measured) 3.26 g/cm3 (Calculated)
Optical Data of Švenekite
Type:
Biaxial
RI values:
nα = 1.602(2) nγ = 1.658(2)
Max. Birefringence:
δ = 0.056
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.
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.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic
Chemistry of Švenekite
Mindat Formula:
Ca(H2AsO4)2
Element Weights:
Elements listed:
Crystallography of Švenekite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.5482(3) Å, b = 7.6973 Å, c = 5.7198 Å
α = 92.59°, β = 109.87°, γ = 109.92°
α = 92.59°, β = 109.87°, γ = 109.92°
Ratio:
a:b:c = 1.111 : 1 : 0.743
Unit Cell V:
332.44 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.968 Å | (33) |
| 3.766 Å | (35) |
| 3.697 Å | (49) |
| 3.554 Å | (100) |
| 3.259 Å | (33) |
| 3.097 Å | (49) |
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 Švenekite
General Appearance of Type Material:
Coatings composed of indistinct radiating to rosette-shaped aggregates up to 3 mm across with a glassy luster, but also white botryoidal crusts with a matte or lustrous surface. The rosettes are composed of thin lens- to blade-shaped crystals, usually 100
Place of Conservation of Type Material:
Mineral collection of the National Museum in Prague, Czech Republic
Geological Setting of Type Material:
Occurs as a supergene mineral that grows directly on granite rocks isolated from other arsenates, which are common in Jáchymov. The mineral crystallized from concentrated strongly acidic solution with a strong circulation, which carried arsenic acid produced by decomposition of native arsenic or arsenides common in the Geschieber vein.
Reference:
Ondruš, P., Skála, R., Plášil, J., Sejkora, J., Veselovský, F., Čejka, J., Kallistová, A., Hloušek, J., Fejfarová, K., Škoda, R., Dušek, M., Gabašová, A., Machovič, V., Lapčák, L. (2013) Švenekite, Ca[AsO2(OH)2]2, a new mineral from Jáchymov, Czech Republic. Mineralogical Magazine, 77 (6) 2711-2724 doi:10.1180/minmag.2013.077.6.02
Synonyms of Švenekite
Other Language Names for Švenekite
Common Associates
Related Minerals - Strunz-mindat Grouping
| 8.AD. | 'Unnamed (Monoclinic polymorph of ximengite)' | Bi(PO4) |
| 8.AD. | Keplerite | Ca9(Ca0.5◻0.5)Mg(PO4)7 |
| 8.AD. | Mazorite | Ba3(PO4)2 |
| 8.AD. | Deynekoite | Ca9◻Fe3+(PO4)7 |
| 8.AD. | Monazite-(Gd) | Gd(PO4) |
| 8.AD.05 | Nahpoite | Na2(PO3OH) |
| 8.AD.10 | Weilite | Ca(HAsO4) |
| 8.AD.10 | Monetite | Ca(PO3OH) |
| 8.AD.15 | Archerite | (K,NH4)(H2PO4) |
| 8.AD.15 | Biphosphammite | NH4(H2PO4) |
| 8.AD.20 | Phosphammite | (NH4)2(PO3OH) |
| 8.AD.25 | Buchwaldite | NaCa(PO4) |
| 8.AD.30 | Schultenite | Pb(HAsO4) |
| 8.AD.35 | Dreyerite | Bi(VO4) |
| 8.AD.35 | Wakefieldite-(La) | La(VO4) |
| 8.AD.35 | Anningite-(Ce) | (Ca0.5Ce4+0.5)(VO4) |
| 8.AD.35 | Pretulite | Sc(PO4) |
| 8.AD.35 | Wakefieldite-(Ce) | Ce(VO4) |
| 8.AD.35 | Wakefieldite-(Y) | Y(VO4) |
| 8.AD.35 | Xenotime-(Yb) | Yb(PO4) |
| 8.AD.35 | 'Chernovite-(Ce)' | (Ce,Y)(AsO4) |
| 8.AD.35 | Xenotime-(Gd) | Gd(PO4) |
| 8.AD.35 | Chernovite-(Y) | Y(AsO4) |
| 8.AD.35 | Xenotime-(Y) | Y(PO4) |
| 8.AD.35 | Wakefieldite-(Nd) | Nd(VO4) |
| 8.AD.40 | Pucherite | Bi(VO4) |
| 8.AD.45 | Ximengite | Bi(PO4) |
| 8.AD.50 | 'UM2005-35-VO:CaFePSiTh' | (Th,Ca)(VO4,SiO4,PO4) |
| 8.AD.50 | Rooseveltite | Bi(AsO4) |
| 8.AD.50 | Gasparite-(Ce) | Ce(AsO4) |
| 8.AD.50 | Monazite-(Sm) | Sm(PO4) |
| 8.AD.50 | Monazite-(Ce) | Ce(PO4) |
| 8.AD.50 | Monazite-(La) | La(PO4) |
| 8.AD.50 | Monazite-(Nd) | Nd(PO4) |
| 8.AD.50 | Gasparite-(La) | La(AsO4) |
| 8.AD.50 | Cheralite | CaTh(PO4)2 |
| 8.AD.55 | Tetrarooseveltite | Bi(AsO4) |
| 8.AD.60 | Chursinite | [Hg2]2+Hg2+2[AsO4]2 |
| 8.AD.65 | Clinobisvanite | Bi(VO4) |
| 8.AD.70 | Gurimite | Ba3(VO4)2 |
| 8.AD.75 | Picaite | NaCa[AsO3OH][AsO2(OH)2] |
Fluorescence of Švenekite
none
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 Švenekite
mindat.org URL:
https://www.mindat.org/min-7076.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 Švenekite
Reference List:
Ondruš, P., Veselovský, F., Skála, R., Cisařová, I., Hloušek, J., Frýda, J., Vavřín, I., Čejka, J., Gabašová, A. (1997) New naturally occurring phases of secondary origin from Jáchymov (Joachimsthal) Journal of the Czech Geological Society, 42 (4) 77-108 [as unnamed phase]
Ondruš, P., Veselovský, F., Gabašová, A., Hloušek, J., Šrein, V. (2003) Supplement to secondary and rock-forming minerals of the Jáchymov ore district. Journal of the Czech Geological Society, 48 (3-4) 149-155
Ondruš, P., Skála, R., Plášil, J., Sejkora, J., Veselovský, F., Čejka, J., Kallistová, A., Hloušek, J., Fejfarová, K., Škoda, R., Dušek, M., Gabašová, A., Machovič, V., Lapčák, L. (2013) Švenekite, Ca[AsO2(OH)2]2, a new mineral from Jáchymov, Czech Republic. Mineralogical Magazine, 77 (6) 2711-2724 doi:10.1180/minmag.2013.077.6.02
Localities for Švenekite
Showing 2 localities.
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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 | |
| [AmMin 84:687] |
| Ondruš et al. (2013) +1 other reference |
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Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic