Classification of Changoite |
| IMA status: | Approved |
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| Strunz 8th edition ID: | 6/C.18-25
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| 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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| mindat.org URL: | http://www.mindat.org/min-6861.html Please feel free to link to this page. |
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Type Occurrence of Changoite |
| Type Locality: | Sierra Gorda District, Tocopilla Province, Antofagasta Region, Chile |
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| Geological Setting of type material: | Oxidation zone of Cu-Zn deposit |
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Physical Properties of Changoite |
| Lustre: | Vitreous |
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| Diaphaneity (Transparency): | Transparent |
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| Colour: | Colorless |
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| Streak: | White |
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| Hardness (Mohs): | 2 - 3 |
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| Density (measured): | 2.50 g/cm3 |
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| Density (calculated): | 2.507 g/cm3 |
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Crystallography of Changoite |
| Crystal System: | Monoclinic |
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| Class (H-M): | 2/m - Prismatic |
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| Space Group: | P21/b (P1 1 21/b) [P21/c] {P1 21/c 1} {P21/a} |
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| Cell Parameters: | a = 5.5075Å, b = 8.2127Å, c = 11.0559Å β = 99.958(10)° |
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| Ratio: | a:b:c = 0.671 : 1 : 1.346 |
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| Unit Cell Volume: | V 492.54 ų |
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| Z: | 2 |
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| Comment: | synthetic |
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Optical Data of Changoite |
| Type: | Biaxial (-) |
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| RI values: | nα = 1.507 nβ = 1.512 nγ = 1.517 |
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| Maximum Birefringence: | δ = 0.010
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | Low |
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| Dispersion: | none |
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| Comments: | Synthetic |
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Chemical Properties of Changoite |
| Formula: | |
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| Essential elements: | H, Na, O, S, Zn |
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| All elements listed in formula: | H, Na, O, S, Zn |
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Relationship of Changoite to other Species |
Related Minerals - Nickel-Strunz Grouping):
- + | |
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Other Names for Changoite |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Other Information: | Water soluble |
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| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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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) |
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Internet Links for Changoite |
| Search Engines: |
Look for Changoite on Google
Look for Changoite images on Google |
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| External Links: | Look for Changoite on WebmineralLook for Changoite on Athena MineralogyLook for Changoite on WikipediaLook for Changoite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Changoite in the Natural History Museum (London) online catalogueChangoite details from Handbook of Mineralogy (PDF) |
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Localities for Changoite |