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Changoite

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Formula:
Na
 
2
Zn(SO
 
4
)
 
2
· 4H
 
2
O
System:MonoclinicColour:Colorless
Lustre:VitreousHardness:2 - 3
Member of:Blödite Group
Name:Named after the Changos people, the early former inhabitants of northern Chile.
This page provides mineralogical data about Changoite.

Classification of Changoite

IMA status:Approved
Strunz 8th edition ID:6/C.18-25
Nickel-Strunz 10th (pending) edition ID: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
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Type Occurrence of Changoite

Type Locality:Sierra Gorda District, Antofagasta Province, Antofagasta Region, Chile
Geological Setting of type material:Oxidation zone of Cu-Zn deposit

Physical Properties of Changoite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colorless
Streak:White
Hardness (Mohs):2 - 3
Density (measured):2.50 g/cm3
Density (calculated):2.507 g/cm3

Crystallography of Changoite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b
Cell Parameters:a = 5.5075Å, b = 8.2127Å, c = 11.0559Å
β = 99.958(10)°
Ratio:a:b:c = 0.671 : 1 : 1.346
Unit Cell Volume:V 492.54 ų
Z:2
Comment:synthetic
X-Ray Powder Diffraction:
d-spacingIntensity
4.550 (58)
4.245 (32)
3.325 (25)
3.289 (100)
3.245 (25)
3.262 (35)
2.631 (27)

Optical Data of Changoite

Type:Biaxial (-)
RI values: nα = 1.507 nβ = 1.512 nγ = 1.517
Maximum Birefringence:δ = 0.010

Chart 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 Changoite

Formula:
Na
 
2
Zn(SO
 
4
)
 
2
· 4H
 
2
O
Simplified for copy/paste:Na2Zn(SO4)2·4H2O
Essential elements:H, Na, O, S, Zn
All elements listed in formula:H, Na, O, S, Zn

Relationship of Changoite to other Species

Member of:Blödite Group
Other Members of Group:

- +
Blödite
Na
 
2
Mg(SO
 
4
)
 
2
· 4H
 
2
O
Cobaltoblödite
Na
 
2
Co(SO
 
4
)
 
2
•4H
 
2
O
Manganoblödite
Na
 
2
Mn(SO
 
4
)
 
2
·4H
 
2
O
Nickelblödite
Na
 
2
(Ni,Mg)(SO
 
4
)
 
2
· 4H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
7.CC.05Krausite
KFe(SO
 
4
)
 
2
· H
 
2
O
7.CC.10Tamarugite
NaAl(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.15Kalinite
KAl(SO
 
4
)
 
2
· 11H
 
2
O Not confirmed
7.CC.15Mendozite
NaAl(SO
 
4
)
 
2
· 11H
 
2
O
7.CC.20Lonecreekite
(NH
 
4
)Fe
3+
 
(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Alum-(K)
KAl(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Alum-(Na)
NaAl(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Tschermigite
(NH
 
4
)Al(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Lanmuchangite
Tl
+
 
Al(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.25Voltaite
K
 
2
Fe
2+
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.25Zincovoltaite
K
 
2
Zn
 
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.25Pertlikite
K
 
2
(Fe
2+
 
,Mg)
 
2
Mg
 
4
Fe
3+
2
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.25Ammoniomagnesiovoltaite
(NH
 
4
)
 
2
Mg
2+
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.30Kröhnkite
Na
 
2
Cu(SO
 
4
)
 
2
· 2H
 
2
O
7.CC.35Ferrinatrite
Na
 
3
Fe(SO
 
4
)
 
3
· 3H
 
2
O
7.CC.40Goldichite
KFe(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.45Löweite
Na
 
12
Mg
 
7
(SO
 
4
)
 
13
· 15H
 
2
O
7.CC.50Blödite
Na
 
2
Mg(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.50Nickelblödite
Na
 
2
(Ni,Mg)(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.50Zincblödite
7.CC.55Leonite
K
 
2
Mg(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.55Mereiterite
K
 
2
Fe(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.60Boussingaultite
(NH
 
4
)
 
2
Mg(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Cyanochroite
K
 
2
Cu(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Mohrite
(NH
 
4
)
 
2
Fe(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Nickelboussingaultite
(NH
 
4
)
 
2
Ni(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Picromerite
K
 
2
Mg(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.65Polyhalite
K
 
2
Ca
 
2
Mg(SO
 
4
)
 
4
· 2H
 
2
O
7.CC.70Leightonite
K
 
2
Ca
 
2
Cu(SO
 
4
)
 
4
· 2H
 
2
O
7.CC.75Amarillite
NaFe(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.80Konyaite
Na
 
2
Mg(SO
 
4
)
 
2
· 5H
 
2
O
7.CC.85Wattevilleite
Na
 
2
Ca(SO
 
4
)
 
2
· 4H
 
2
O (?)

Other Names for Changoite

Synonyms:
IMA1997-041Zincblödite
Other Languages:
German:Changoit
Russian:Чангоит
Spanish:Changoita

Other Information

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

References for Changoite

Reference List:

- +
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 Changoite

Search Engines:
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  • External Links:
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  • Look for Changoite on Athena Mineralogy
  • Look for Changoite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Changoite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Rare and Unusual minerals at Mineralogical Research Company
  • Localities for Changoite

    The 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. ? 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
     
    • Antofagasta Region
      • Antofagasta Province
    NJMM (1999), 97; MR 30 (1999), 400; Min. Abstr. 50/3 (1999), 378
          • Caracoles
    Samples analysed by Dr. Jochen Schluter, Curator of Hamburg Mineralogical Museum, Germany
    Namibia
     
    • Erongo Region
      • Karibib District
        • Spitzkopje 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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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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