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Changoite

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Formula:
Na2Zn(SO4)2 · 4H2O
System:
Monoclinic
Colour:
Colorless
Lustre:
Vitreous
Hardness:
2 - 3
Member of:
Name:
Named after the Changos people, the early former inhabitants of northern Chile.
This page provides mineralogical data about Changoite.

Classification of Changoite

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
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First Recorded Occurrence of Changoite

Geological Setting of First Recorded Material:
Oxidation zone of Cu-Zn deposit

Physical Properties of Changoite

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

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 Data:
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
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 Changoite

Formula:
Na2Zn(SO4)2 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Changoite to other Species

Member of:
Other Members of Group:
BlöditeNa2Mg(SO4)2 · 4H2O
CobaltoblöditeNa2Co(SO4)2•4H2O
ManganoblöditeNa2Mn(SO4)2·4H2O
NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.05KrausiteKFe(SO4)2 · H2O
7.CC.10TamarugiteNaAl(SO4)2 · 6H2O
7.CC.15KaliniteKAl(SO4)2 · 11H2O Not confirmed
7.CC.15MendoziteNaAl(SO4)2 · 11H2O
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2O
7.CC.20Alum-(K)KAl(SO4)2 · 12H2O
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2O
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2O
7.CC.25VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
7.CC.25ZincovoltaiteK2Zn5Fe33+Al(SO4)12 · 18H2O
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe23+Al(SO4)12 · 18H2O
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg52+Fe33+Al(SO4)12 · 18H2O
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2O
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2O
7.CC.40GoldichiteKFe(SO4)2 · 4H2O
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2O
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2O
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.50Zincblödite
7.CC.55LeoniteK2Mg(SO4)2 · 4H2O
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2O
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
7.CC.60CyanochroiteK2Cu(SO4)2 · 6H2O
7.CC.60Mohrite(NH4)2Fe(SO4)2 · 6H2O
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2O
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2O
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2O
7.CC.75AmarilliteNaFe(SO4)2 · 6H2O
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2O
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)

Other Names for Changoite

Name in Other Languages:
German:Changoit
Spanish:Changoita

Other Information

Other Information:
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 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

Localities for Changoite

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
 
  • 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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