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Changoite

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Formula:
Na2Zn(SO4)2 · 4H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
2.50
Crystal System:
Monoclinic
Member of:
Name:
Named after the Changos people, the early former inhabitants of northern Chile.
Chemically quite similar to gordaite. Compare UM1975-16-SO:HKZn.


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Classification of ChangoiteHide

Approved
7.CC.50

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations

Pronounciation of ChangoiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of ChangoiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
2 - 3 on Mohs scale
Density:
2.50 g/cm3 (Measured)    2.507 g/cm3 (Calculated)

Optical Data of ChangoiteHide

Type:
Biaxial (-)
RI values:
nα = 1.507 nβ = 1.512 nγ = 1.517
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none
Comments:
Synthetic

Chemical Properties of ChangoiteHide

Formula:
Na2Zn(SO4)2 · 4H2O

Crystallography of ChangoiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 5.5075 Å, b = 8.2127 Å, c = 11.0559 Å
β = 99.958(10)°
Ratio:
a:b:c = 0.671 : 1 : 1.346
Unit Cell V:
492.54 ų
Z:
2
Comment:
synthetic

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.550 (58)
4.245 (32)
3.325 (25)
3.289 (100)
3.245 (25)
3.262 (35)
2.631 (27)

Type Occurrence of ChangoiteHide

Geological Setting of Type Material:
Oxidation zone of Cu-Zn deposit

Synonyms of ChangoiteHide

Other Language Names for ChangoiteHide

German:Changoit
Spanish:Changoita

Relationship of Changoite to other SpeciesHide

Member of:
Other Members of this group:
BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
CobaltoblöditeNa2Co(SO4)2•4H2OMon. 2/m : P21/b
ManganoblöditeNa2Mn(SO4)2·4H2O Mon. 2/m : P21/b
NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O

Common AssociatesHide

Associated Minerals Based on Photo Data:
Caracolite4 photos of Changoite associated with Caracolite on mindat.org.
Kröhnkite2 photos of Changoite associated with Kröhnkite on mindat.org.
Sphalerite1 photo of Changoite associated with Sphalerite on mindat.org.
Quartz1 photo of Changoite associated with Quartz on mindat.org.
Chalcedony1 photo of Changoite associated with Chalcedony on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.CC.AndychristyitePbCu2+Te6+O5(H2O)Tric. 1 : P1
7.CC.05KrausiteKFe(SO4)2 · H2OMon. 2/m : P21/m
7.CC.10TamarugiteNaAl(SO4)2 · 6H2OMon. 2/m
7.CC.15KaliniteKAl(SO4)2 · 11H2OMon. 2/m : B2/b
7.CC.15MendoziteNaAl(SO4)2 · 11H2OMon. 2/m
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2OIso.
7.CC.20Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3)
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.25VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2OTet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2OTrig. 3 : P3
7.CC.40GoldichiteKFe(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2OTrig.
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.55LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2OMon.
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m
7.CC.60Mohrite(NH4)2Fe(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2OTric.
7.CC.75AmarilliteNaFe(SO4)2 · 6H2OMon. 2/m : B2/b
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)Orth.

Other InformationHide

Notes:
Water soluble
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 ChangoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schlüter, J.; Klaska, K.-H.; Gebhard, G. (1999): Changoite, Na2Zn(SO4)2.4H2O, the zinc analog of blödite, a new mineral from Sierra Gorda, Antofagasta, Chile. Neues Jahrbuch fuer Mineralogie, Monatshefte, 1999, 97-103.
Stoilova D. and Wildner M. (2004): Blödite-type compounds Na2Me(SO4)2•4H2O (Me = Mg, Co, Ni, Zn): crystal structures and hydrogen bonding systems. J. Mol. Struct. 706, 57-63.
Diaz de Vivar, M.E., S. Baggio, A. Ibanez & R. Baggio (2008): Disodium zinc bis(sulfate) tetrahydrate (zinc astrakanite) revisited. Acta Crystallogr. E64, i30-i31.

Internet Links for ChangoiteHide

Localities for ChangoiteHide

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.
Chile (TL)
 
  • Antofagasta Region
    • Antofagasta Province
NJMM (1999), 97; MR 30 (1999), 400; Min. Abstr. 50/3 (1999), 378
Samples analysed by Dr. Jochen Schluter, Curator of Hamburg Mineralogical Museum, Germany
Namibia
 
  • Erongo Region
    • Swakopmund District
      • Arandis
        • Rössing Mountains Area
Dr. Ing. Thomas Krassmann specimen at Munich Show 2012 (Krassmann & Kolitsch, to be published)
Peru
 
  • Huancavelica Department
    • Huancavelica Province
      • Huachocolpa District
Cosme R. Pérez-Puig (2008) Investigación de los controles geológicos de la mineralización en veta Esperanza (Huachocolpa, Perú)
Vietnam
Pavel M. Kartashov analytical data (2006)
Mineral and/or Locality  
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