| Changoite | |
| Category: | Sulfate mineral |
| Formula: | Na2Zn(SO4)2·4H2O |
| Imasymbol: | Cgo[1] |
| Strunz: | 7.CC.50 (10 ed) 6/C.18-25 (8 ed) |
| Class: | Prismatic (2/m) (same H-M symbol) |
| Symmetry: | P21/a |
| Unit Cell: | a = 11.08, b = 8.25, c = 5.53 [Å], β = 100.18° (approximated); Z = 2 |
| Color: | Colorless |
| Habit: | Anhedral crystals, in small veins |
| Mohs: | 2-3 |
| Luster: | Vitreous |
| Streak: | White |
| Diaphaneity: | Transparent |
| Gravity: | 2.50 (measured) |
| Opticalprop: | Biaxal (-) |
| Refractive: | nα=1.51, nβ=1.51, nγ=1.52 (approximated) |
| 2V: | 83° (calculated) |
| References: | [2] [3] [4] |
Changoite is a rare zinc sulfate mineral with the formula Na2Zn(SO4)2·4H2O.[5] Chagoite was discovered in the San Francisco Mine near Sierra Gorda, Antofagasta, Chile. The mineral is a zinc-analogue of blödite, cobaltoblödite, manganoblödite and nickelblödite - other representatives of the blödite group. In terms of chemistry changoite is somewhat similar to gordaite.[6] The mineral's name comes from the early inhabitants of Chile - Changos.
Traces of magnesium and calcium in changoite are negligible.
Minerals associating with changoite are gypsum, zinc-bearing paratacamite, and thénardite.