Changoite
| Changoite | |
|---|---|
| General | |
| Category | Sulfate mineral |
| Formula (repeating unit) |
Na2Zn(SO4)2•4H2O |
| Strunz classification | 6/C.18-25 |
| Crystal symmetry | Monoclinic - Prismatic (2/m) |
| Unit cell | a=11.08, b=8.25, c=5.53 [Å], β=100.18o (approximated) |
| Identification | |
| Color | Colorless |
| Crystal habit | anhedral crystals, in small veins |
| Crystal system | Monoclinic, P21/a |
| Mohs scale hardness | 2-3 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Trasnparent |
| Density | 2.50 (measured) |
| Optical properties | Biaxal (-) |
| Refractive index | nα=1.51, nβ=1.51, nγ=1.52 (approximated) |
| 2V angle | 83o (calculated) |
| References | [1][2][3] |
Changoite is a rare nickel mineral with the formula Na2Zn(SO4)2•4H2O.[3][1] Chagoite was discovered in San Francisco mine near Sierra Gorda, Antofagasta, Chile.[2] The mineral is a zinc-analogue of blödite, cobaltoblödite, manganoblödite and nickelblödite - other representatives of the blödite group.[3] In terms of chemistry changoite is somewhat similar to gordaite.[4] Mineral's name comes from the early inhabitants of Chile - Changos.[2]
Notes on chemistry
Traces of magnesium and calcium in changoite are negligible.[2]
Association and origin
Minerals associating with changoite are gypsum, zinc-bearing paratacamite, and thénardite.[1]
References
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- ↑ 1.0 1.1 1.2 Schlüter, J., Klaska, K.-H., and Gebhard, G., 1999. Changoite, Na2Zn(SO4)2·4H2O, the zinc analogue of blödite, a new mineral from Sierra Gorda, Antofagasta, Chile. Neues Jahrbuch für Mineralogie - Monatshefte 3(3), 97-103.
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