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Machatschkiite

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Felix Machatschki
Formula:
(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O
System:
Hexagonal
Colour:
Colorless
Hardness:
2 - 3
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.


Classification of Machatschkiite

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 Machatschkiite

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

Optical Data of Machatschkiite

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 Machatschkiite

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

Crystallography of Machatschkiite

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

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

Relationship of Machatschkiite to other Species

8.CJ.05StercoriteNa(NH4)HPO4 · 4H2O
8.CJ.10Mundrabillaite(NH4)2Ca(HPO4)2 · H2O
8.CJ.10Swaknoite(NH4)2Ca(HPO4)2 · H2O
8.CJ.15NabaphiteNaBaPO4 · 9H2O
8.CJ.15NastrophiteNa(Sr,Ba)PO4 · 9H2O
8.CJ.20HaidingeriteCaHAsO4 · H2O
8.CJ.25VladimiriteCa4(AsO4)2(AsO3OH) · 4H2O
8.CJ.30FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2O
8.CJ.40PhaunouxiteCa3(AsO4)2 · 11H2O
8.CJ.40RauenthaliteCa3(AsO4)2 · 10H2O
8.CJ.45Brockite(Ca,Th,Ce)PO4 · H2O
8.CJ.45Grayite(Th,Pb,Ca)(PO4) · H2O
8.CJ.45Rhabdophane-(Ce)(Ce,La)(PO4) · H2O
8.CJ.45Rhabdophane-(La)(La,Ce)(PO4) · H2O
8.CJ.45Rhabdophane-(Nd)(Nd,Ce,La)(PO4) · H2O
8.CJ.45Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2O
8.CJ.45SmirnovskiteCaTh(PO4)2 · nH2O
8.CJ.50ArdealiteCa2(HPO4)(SO4) · 4H2O
8.CJ.50BrushiteCa(HPO4) · 2H2O
8.CJ.50Churchite-(Y)Y(PO4) · 2H2O
8.CJ.50PharmacoliteCa(HAsO4) · 2H2O
8.CJ.50Churchite-(Nd)Nd(PO4) · 2H2O
8.CJ.55McneariteNaCa5(AsO4)(HAsO4)4 · 4H2O
8.CJ.60DorfmaniteNa2HPO4 · 2H2O
8.CJ.65SincositeCa(VO)2(PO4)2 · 5H2O
8.CJ.65BariosincositeBa(VO)2(PO4)2 · 4H2O
8.CJ.70CatalanoiteNa2(HPO4) · 8H2O
8.CJ.75GuériniteCa5(AsO4)2(HAsO4)2 · 9H2O
8.CJ.85NingyoiteCaU(PO4)2 · 1-2H2O
22.3.1ParnauiteCu9(AsO4)2(SO4)(OH)10 · 7H2O
22.3.2ArdealiteCa2(HPO4)(SO4) · 4H2O
22.3.4ClinotyroliteCa2Cu9(AsO4,SO4)4(OH,O)10 · 10H2O
22.3.5PeisleyiteNa2Al9[(P,S)O4]8(OH)6•28H2O
22.3.6ChalcophylliteCu18Al2(AsO4)4(SO4)3(OH)24 · 36H2O
22.3.7WoodhouseiteCaAl3(PO4)(SO4)(OH)6
22.3.8Schlossmacherite(H3O)Al3(SO4)2(OH)6
22.3.9SvanbergiteSrAl3(PO4)(SO4)(OH)6
22.3.10KemmlitziteSrAl3(AsO4)(SO4)(OH)6
22.3.11SanjuaniteAl2(PO4)(SO4)(OH) · 9H2O
22.3.12KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2O
22.3.13HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2O
22.3.14WeileriteBaAl3(AsO4)(SO4)(OH)6
22.3.15TsumebitePb2Cu(PO4)(SO4)(OH)
22.3.16ArsentsumebitePb2Cu(AsO4)(SO4)(OH)
22.3.17HinsdalitePbAl3(PO4)(SO4)(OH)6
22.3.18HidalgoitePbAl3(AsO4)(SO4)(OH)6
22.3.19OrpheitePbAl3(PO4)(SO4)(OH)6
22.3.20CoconinoiteFe23+Al2(UO2)2(PO4)4(SO4)(OH)2 · 20H2O
22.3.21Sasaite(Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2O
22.3.22Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2O
22.3.23CorkitePbFe3(PO4)(SO4)(OH)6
22.3.24BeudantitePbFe3(AsO4)(SO4)(OH)6
22.3.25DiadochiteFe23+(PO4)(SO4)(OH) · 5H2O
22.3.26SarmientiteFe23+(AsO4)(SO4)(OH) · 5H2O
22.3.27BukovskýiteFe23+(AsO4)(SO4)(OH) · 9H2O
22.3.28ZýkaiteFe43+(AsO4)3(SO4)(OH) · 15H2O
22.3.29TooeleiteFe63+(As3+O3)4(SO4)(OH)4 · 4H2O
22.3.30Pitticite(Fe, SO4, AsO4, H2O) ?
22.3.31Xiangjiangite(Fe3+,Al)(UO2)4(PO4)2(SO4)2(OH) · 22H2O

Other Names for Machatschkiite

Name in Other Languages:

Other Information

Other Information:
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 Machatschkiite

Reference List:
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 Machatschkiite

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https://www.mindat.org/min-2510.html
Please feel free to link to this page.

Localities for Machatschkiite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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