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Changoite

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© Pavel M. Kartashov

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Formula:
Na
 
2
Zn(SO
 
4
)
 
2
·4H
 
2
O
System:MonoclinicColour:Colorless
Lustre:VitreousHardness:2 - 3
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, Tocopilla 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 (P1 1 21/b) [P21/c] {P1 21/c 1} {P21/a}
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

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
Essential elements:H, Na, O, S, Zn
All elements listed in formula:H, Na, O, S, Zn

Relationship of Changoite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.CC.05Krausite
KFe(SO
 
4
)
 
2
·H
 
2
O
7.CC.10Amarillite
NaFe(SO
 
4
)
 
2
·6H
 
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
·4H
 
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
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.60Konyaite
Na
 
2
Mg(SO
 
4
)
 
2
·5H
 
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.65Wattevilleite
Na
 
2
Ca(SO
 
4
)
 
2
·4H
 
2
O (?)
7.CC.70Leightonite
K
 
2
Ca
 
2
Cu(SO
 
4
)
 
4
·2H
 
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.

Diaz de Vivar, M.E., S. Baggio, A. Ibanez,& R. Baggio: Disodium zinc bis(sulfate) tetrahydrate (zinc astrakanite) revisited. Acta Cryst. E64, i30-i31(2008)

Internet Links for Changoite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Changoite in the Natural History Museum (London) online catalogue
  • Changoite details from Handbook of Mineralogy (PDF)
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    Localities for Changoite

    (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
      • Tocopilla Province
    		NJMM (1999), 97; MR 30 (1999), 400; Min. Abstr. 50/3 (1999), 378
    Mineral and/or Locality
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