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Chudobaite

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Formula:
(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
System:
Triclinic
Hardness:
2½ - 3
Name:
For German mineralogist Karl Franz Chudoba (1898-1976)
The Mg analogue of geigerite.

Classification of Chudobaite

Approved
8.CE.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
39.2.6.1

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
20.3.16

20 : Arsenates (also arsenates with phosphate, but without other anions)
3 : Arsenates of Zn, Cd or Hg
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First Recorded Occurrence of Chudobaite

Year of Discovery:
1960

Physical Properties of Chudobaite

Hardness (Mohs):
2½ - 3

Crystallography of Chudobaite

Crystal System:
Triclinic
Cell Parameters:
a = 7.69Å, b = 11.37Å, c = 6.59Å
α = 115.2°, β = 95.9°, γ = 94.1°
Ratio:
a:b:c = 0.676 : 1 : 0.58

Optical Data of Chudobaite

Type:
Biaxial (-)
RI values:
nα = 1.583 nβ = 1.608 nγ = 1.633
2V:
Measured: 79° , Calculated: 88°
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
small

Chemical Properties of Chudobaite

Formula:
(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
Essential elements:
All elements listed in formula:

Relationship of Chudobaite to other Species

Other Members of Group:
GeigeriteMn52+(AsO4)2(HAsO4)2 · 10H2O
KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2O
OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2O
8.CE.05GeigeriteMn52+(AsO4)2(HAsO4)2 · 10H2O
8.CE.10NewberyiteMg(HPO4) · 3H2O
8.CE.15BrassiteMg(HAsO4) · 4H2O
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2O
8.CE.20RössleriteMg(HAsO4) · 7H2O
8.CE.25MetaswitzeriteMn3(PO4)2 · 4H2O
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2O
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 8-9H2O
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2O
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2O
8.CE.35BobierriteMg3(PO4)2 · 8H2O
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2O
8.CE.40ArupiteNi3(PO4)2 · 8H2O
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2O
8.CE.40ErythriteCo3(AsO4)2 · 8H2O
8.CE.40FerrisymplesiteFe33+(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2O
8.CE.40KöttigiteZn3(AsO4)2 · 8H2O
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
8.CE.40ParasymplesiteFe32+(AsO4)2 · 8H2O
8.CE.40VivianiteFe32+(PO4)2 · 8H2O
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2O
8.CE.45SymplesiteFe32+(AsO4)2 · 8H2O
8.CE.50CattiiteMg3(PO4)2 · 22H2O
8.CE.55KoninckiteFe3+PO4 · 3H2O
8.CE.60KaňkiteFeAsO4 · 3.5H2O
8.CE.65SteigeriteAl(VO4) · 3H2O
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2O
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2O
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2O
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2O
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2O
8.CE.80SantabarbaraiteFe33+(PO4)2(OH)3 · 5H2O
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)
20.3.1AdamiteZn2(AsO4)(OH)
20.3.2ParadamiteZn2(AsO4)(OH)
20.3.3KoritnigiteZn(HAsO4) · H2O
20.3.4LegranditeZn2(AsO4)(OH) · H2O
20.3.5WarikahniteZn3(AsO4)2 · 2H2O
20.3.6KöttigiteZn3(AsO4)2 · 8H2O
20.3.7StranskiiteZn2Cu(AsO4)2
20.3.8Philipsburgite(Cu,Zn)6(AsO4,PO4)2(OH)6 · H2O
20.3.9AustiniteCaZn(AsO4)(OH)
20.3.10ProsperiteCaZn2(AsO4)(HAsO4)(OH)
20.3.11GaititeCa2Zn(AsO4)2 · 2H2O
20.3.12ZincroseliteCa2Zn(AsO4)2 · 2H2O
20.3.13O'DanieliteNa(Zn,Mg)3H2(AsO4)3
20.3.14JohilleriteNa(Mg,Zn)3Cu(AsO4)3
20.3.15Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8
20.3.17Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6
20.3.18LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
20.3.19Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)
20.3.20OjuelaiteZnFe23+(AsO4)2(OH)2 · 4H2O
20.3.21FahleiteZn5CaFe2(AsO4)6 · 14H2O
20.3.22KeyiteCu32+Zn4Cd2(AsO4)6 · 2H2O

Other Names for Chudobaite

Name in Other Languages:
German:Chudobait
Spanish:Chudobaita

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.

References for Chudobaite

Reference List:
Strunz, H. (1960) Chudobait, ein neues Mineral von Tsumeb. Neues Jahrb. Mineral., Monatsh., 1–7.

American Mineralogist 45: 1130.

Dorner, R. and Weber, K. (1976) Die Kristallstruktur von Chudobait, (Mg,Zn)5H2[AsO4]4 •10H2O. Naturwiss., 63, 243.

American Mineralogist 62: 599.

Graeser, S.; Schwander, H.; Bianchi, R.; Pilati, T.; Gramaccioli, C. M. (1989) Geigerite, the manganese analogue of chudobaite: Its description and crystal structure. American Mineralogist 74, 676-684.

Internet Links for Chudobaite

Localities for Chudobaite

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.
Chile
 
  • Tarapacá Region
    • El Tamarugal Province
      • Salar Grande
Kampf, A.R., Nash, B.P., Dini, M., Molina Donoso, A.A. (2013): Magnesiokoritnigite, Mg(AsO3OH)•H2O, from the Torrecillas mine, Iquique Province, Chile: the Mg-analogue of koritnigite. Mineralogical Magazine, 77, 3081-3092.
Namibia
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Neues Jahrb.Min.,Mh.(1960) 1-7
Mineral and/or Locality  
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