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Machatschkiite

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Felix Machatschki
Formula:
(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O
Colour:
Colorless
Hardness:
2 - 3
Specific Gravity:
2.5 - 2.6
Crystal System:
Hexagonal
Name:
Honors Felix Karl Ludwig Machatschki (22 September 1895, Arnfels, Styria, Austria – 17 February 1970), Professor of Mineralogy, University of Vienna, Vienna, Austria.
Rare example of a mineral with arsenate and phosphate anions on separate structural positions (i.e., not substituting for each other). Second such mineral is epifanovite, while the third is walentaite.


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Classification of MachatschkiiteHide

Approved
First Published:
1977
8.CJ.35

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
39.3.8.1

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
3 : Miscellaneous
22.3.3

22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates

Physical Properties of MachatschkiiteHide

Transparency:
Transparent, Translucent
Colour:
Colorless
Hardness:
2 - 3 on Mohs scale
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.5 - 2.6 g/cm3 (Measured)    2.594 g/cm3 (Calculated)

Optical Data of MachatschkiiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.593 nε = 1.585
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of MachatschkiiteHide

Formula:
(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O
IMA Formula:
Ca6(AsO4)(AsO3OH)3PO4 · 15H2O

Crystallography of MachatschkiiteHide

Crystal System:
Hexagonal
Cell Parameters:
a = 15.127 Å, c = 22.471 Å
Ratio:
a:c = 1 : 1.485
Unit Cell V:
4,453.06 ų (Calculated from Unit Cell)
Z:
6
Morphology:
Pseudorhombohedral crystals, {10-11} with minor {10-12}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.59 (10)
5.34 (8)
3.59 (8)
2.86 (8)
2.83 (8)
2.70 (8)
2.67 (8)

Type Occurrence of MachatschkiiteHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 137412.

Synonyms of MachatschkiiteHide

Other Language Names for MachatschkiiteHide

Related Minerals - Nickel-Strunz GroupingHide

8.CJ.05StercoriteNa(NH4)HPO4 · 4H2OTric.
8.CJ.10Mundrabillaite(NH4)2Ca(HPO4)2 · H2OMon. m : Pm
8.CJ.10Swaknoite(NH4)2Ca(HPO4)2 · H2OOrth.
8.CJ.15NabaphiteNaBaPO4 · 9H2OIso.
8.CJ.15NastrophiteNa(Sr,Ba)PO4 · 9H2O
8.CJ.20HaidingeriteCaHAsO4 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
8.CJ.25VladimiriteCa4(AsO4)2(AsO3OH) · 4H2OMon. 2/m : P21/b
8.CJ.30FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CJ.40PhaunouxiteCa3(AsO4)2 · 11H2OTric.
8.CJ.40RauenthaliteCa3(AsO4)2 · 10H2OTric. 1 : P1
8.CJ.45Brockite(Ca,Th,Ce)PO4 · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Grayite(Th,Pb,Ca)(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(Ce)(Ce,La)(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(La)(La,Ce)(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(Nd)(Nd,Ce,La)(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex.
8.CJ.45SmirnovskiteCaTh(PO4)2 · nH2OHex. 6 2 2 : P62 2 2
8.CJ.50ArdealiteCa2(HPO4)(SO4) · 4H2OMon. m : Bb
8.CJ.50BrushiteCa(HPO4) · 2H2OMon. 2/m : B2/b
8.CJ.50Churchite-(Y)Y(PO4) · 2H2OMon. 2/m : B2/b
8.CJ.50PharmacoliteCa(HAsO4) · 2H2OMon. m
8.CJ.50Churchite-(Nd)Nd(PO4) · 2H2OMon.
8.CJ.55McneariteNaCa5(AsO4)(HAsO4)4 · 4H2OTric.
8.CJ.60DorfmaniteNa2HPO4 · 2H2OOrth.
8.CJ.65SincositeCa(VO)2(PO4)2 · 5H2OTet. 4/mmm (4/m 2/m 2/m) : P42/nnm
8.CJ.65BariosincositeBa(VO)2(PO4)2 · 4H2OTet.
8.CJ.70CatalanoiteNa2(HPO4) · 8H2OOrth. mmm (2/m 2/m 2/m) : Ibca
8.CJ.75GuériniteCa5(AsO4)2(HAsO4)2 · 9H2OMon. 2/m : P21/b
8.CJ.85NingyoiteCaU(PO4)2 · 1-2H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.3.1ParnauiteCu9(AsO4)2(SO4)(OH)10 · 7H2OOrth. mm2 : Pmn21
22.3.2ArdealiteCa2(HPO4)(SO4) · 4H2OMon. m : Bb
22.3.4ClinotyroliteCa2Cu9(AsO4,SO4)4(OH,O)10 · 10H2OMon.
22.3.5PeisleyiteNa2Al9[(P,S)O4]8(OH)6•28H2OTric. 1 : P1
22.3.6ChalcophylliteCu18Al2(AsO4)4(SO4)3(OH)24 · 36H2OTrig. 3 : R3
22.3.7WoodhouseiteCaAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.8Schlossmacherite(H3O)Al3(SO4)2(OH)6Trig.
22.3.9SvanbergiteSrAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.10KemmlitziteSrAl3(AsO4)(SO4)(OH)6Trig.
22.3.11SanjuaniteAl2(PO4)(SO4)(OH) · 9H2O
22.3.12KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
22.3.13HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2OTric.
22.3.14WeileriteBaAl3(AsO4)(SO4)(OH)6
22.3.15TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
22.3.16ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
22.3.17HinsdalitePbAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.18HidalgoitePbAl3(AsO4)(SO4)(OH)6Trig.
22.3.19OrpheitePbAl3(PO4)(SO4)(OH)6Trig.
22.3.20CoconinoiteFe3+2Al2(UO2)2(PO4)4(SO4)(OH)2 · 20H2OMon.
22.3.21Sasaite(Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2OOrth.
22.3.22Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex.
22.3.23CorkitePbFe3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.24BeudantitePbFe3(AsO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.25DiadochiteFe3+2(PO4)(SO4)(OH) · 5H2OAmor.
22.3.26SarmientiteFe3+2(AsO4)(SO4)(OH) · 5H2OMon. 2/m : P21/b
22.3.27BukovskýiteFe3+2(AsO4)(SO4)(OH) · 9H2OTric. 1 : P1
22.3.28ZýkaiteFe3+4(AsO4)3(SO4)(OH) · 15H2OOrth.
22.3.29TooeleiteFe3+6(As3+O3)4(SO4)(OH)4 · 4H2OMon. 2/m : B2/m
22.3.30Pitticite(Fe, SO4, AsO4, H2O) ?Amor.
22.3.31Xiangjiangite(Fe3+,Al)(UO2)4(PO4)2(SO4)2(OH) · 22H2OTet.

Other InformationHide

Notes:
Ready dissolves in dilute HCl or 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.

References for MachatschkiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Walenta, K. (1977) Machatschkiit, ein neues Arsenmineral aus der Grube Anton im Heubachtal bei Schiltach (Schwarzwald, Bundesrepublik Deutschland). Tschermaks Mineralogische und Petrographische Mitteilungen: 24: 125-132.
Fleischer, M., Cabri, L.J., Pabst, A. (1977) New mineral names. American Mineralogist: 62: 1259-1262.
Walenta, K., (1982) Zum Chemismus von Admontit und Machatschkiit. Schweizerische Mineralogische und Petrographische Mitteilungen: 62: 177-183.
Effenberger, H., Mereiter, K., Pimminger, M., Zemann, J. (1982) Machatschkiite: crystal structure and revision of the chemical formula. Tschermaks Mineralogische und Petrographische Mitteilungen: 30: 145-155.
Fleischer, M., Burns, R.G., Cabri, L.J., Francis, C.A., Pabst, A. (1982) New mineral names. American Mineralogist: 67: 413-418.
Dunn, P.J., Cabri, L.J., Clark, A.M., Fleischer, M. (1983) New mineral names. American Mineralogist: 68: 849-852.

Internet Links for MachatschkiiteHide

Localities for MachatschkiiteHide

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.
Germany (TL)
 
  • Baden-Württemberg
    • Black Forest
      • Schenkenzell
        • Wittichen
          • Heubach Valley
Tscherm.Min.Petr.Mitt.(1977) 24, 125-132
Mineral and/or Locality  
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