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Švenekite

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About ŠvenekiteHide

07391950015145081504544.jpg
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.


Classification of ŠvenekiteHide

Approved
Approval Year:
1999
First Published:
2013
8.AD.10

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 7th ed.:
37.1.6.1

Physical Properties of ŠvenekiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless, white
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Very Good
very good cleavage on {010}
Fracture:
Irregular/Uneven
Density:
3.16(1) g/cm3 (Measured)    3.26 g/cm3 (Calculated)

Optical Data of ŠvenekiteHide

Type:
Biaxial
RI values:
nα = 1.602(2) nγ = 1.658(2)
Max Birefringence:
δ = 0.056
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemical Properties of ŠvenekiteHide

Formula:
Ca(H2AsO4)2
IMA Formula:
Ca[AsO2(OH)2]2

Crystallography of ŠvenekiteHide

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°
Ratio:
a:b:c = 1.111 : 1 : 0.743
Unit Cell V:
332.44 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.968 Å(33)
3.766 Å(35)
3.697 Å(49)
3.554 Å(100)
3.259 Å(33)
3.097 Å(49)

Type Occurrence of ŠvenekiteHide

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: 2711-2724.

Synonyms of ŠvenekiteHide

Other Language Names for ŠvenekiteHide

German:Švenekit

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Švenekite associated with UraniniteUO2

Related Minerals - Nickel-Strunz GroupingHide

8.AD.05NahpoiteNa2HPO4Mon. 2/m : P21/m
8.AD.10MonetiteCa(HPO4)Tric. 1
8.AD.10WeiliteCa(HAsO4)Tric. 1 : P1
8.AD.15Archerite(K,NH4)(H2PO4)Tet. 4 2m : I4 2d
8.AD.15BiphosphammiteNH4(H2PO4)Tet. 4 2 2 : I41 2 2
8.AD.20Phosphammite(NH4)2(HPO4)Mon. 2/m : P21/b
8.AD.25BuchwalditeNaCa(PO4)Orth. mm2 : Pmn21
8.AD.30SchultenitePb(HAsO4)Mon. 2/m : P2/b
8.AD.35Chernovite-(Y)Y(AsO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35DreyeriteBi(VO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35Wakefieldite-(Ce)Ce(VO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35Wakefieldite-(Y)Y(VO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35Xenotime-(Y)Y(PO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35PretuliteSc(PO4)Tet.
8.AD.35Xenotime-(Yb)Yb(PO4)Tet.
8.AD.35Wakefieldite-(La)La(VO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.35Wakefieldite-(Nd)Nd(VO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.AD.40PucheriteBi(VO4)Orth. mmm (2/m 2/m 2/m)
8.AD.45XimengiteBi(PO4)Trig.
8.AD.50Gasparite-(Ce)Ce(AsO4)Mon. 2/m : P21/m
8.AD.50Monazite-(Ce)Ce(PO4)Mon. 2/m : P21/b
8.AD.50Monazite-(La)La(PO4)Mon. 2/m : P21/m
8.AD.50Monazite-(Nd)Nd(PO4)Mon. 2/m
8.AD.50RooseveltiteBi(AsO4)Mon. 2/m
8.AD.50CheraliteCaTh(PO4)2Mon. 2/m
8.AD.50Monazite-(Sm)Sm(PO4)Mon. 2/m : P21/m
8.AD.50UM2005-35-VO:CaFePSiTh(Th,Ca)(VO4,SiO4,PO4)
8.AD.50Gasparite-(La)LaAsO4Mon. 2/m
8.AD.55TetrarooseveltiteBi(AsO4)Tet.
8.AD.60Chursinite(Hg+2)0.5Hg2+(AsO4)Mon. 2/m : P21/b
8.AD.65ClinobisvaniteBi(VO4)Mon. 2/m

Fluorescence of ŠvenekiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ŠvenekiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chiari, G., Ferraris, G. (1971) The crystal structure of calcium dihydrogen arsenate, Ca(H2AsO4)2. Atti della Accademia delle Scienze di Torino, Classe di Scienze Fisiche, Matematiche e Naturali: 105: 725-743.
Ferraris, G., Jones, D.W., Yerkess, J. (1972) A neutron diffraction study of the crystal structure of calcium bis(dihydrogen arsenate), Ca(H2AsO4)2. Acta Crystallographica: B28: 2430-2437.
Ondruš, P., Veselovský, F., Skála, R., Císarová, I., Hloušek, J., Frýda, J., Vavrín, I., Čejka, J. and Gabašová, A. (1997) New naturally occurring phases of secondary origin from Jáchymov (Joachimsthal). Journal of the Czech Geological Society: 42: 77-107. [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, Prague: 48(3-4): 151.
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: 2711-2724.
Belakovskiy, D.I., Cámara, F., Gagne, O.C., Uvarova, Y. (2015) New mineral names. American Mineralogist: 100: 2352-2362. (Abs.)

Internet Links for ŠvenekiteHide

Localities for ŠvenekiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic
 
  • Karlovy Vary Region
    • Karlovy Vary District
[AmMin 84:687]
        • Svornost Mine (Einigkeit Mine)
Belakovskiy D I, Cámara F, Gagne O C, Uvarova Y (2015) New mineral names. American Mineralogist 100, 2352-2362
 
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