Keystoneite
| Keystoneite | |
|---|---|
| General | |
| Category | Tellurite minerals |
| Group | Zemannite group |
| Formula | Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O |
| IMA symbol | Kys |
| IMA status | Approved |
| Strunz classification | 4.JM.05 |
| Dana classification | 34.3.2.3 |
| Crystal system | Hexagonal |
| Crystal class | Hexagonal pyramidal (6) |
| Space group | P63 (no. 173) |
| Identification | |
| Color | Golden yellow |
| Lustre | Adamantine |
| Streak | Pale yellow-green |
| Diaphaneity | Translucent |
| Specific gravity | 4.4 |
| Density | 4.4 g/cm3 |
| References | [1] |
Keystoneite is a naturally occurring tellurite mineral. It was discovered in 1988 at Keystone mine, Colorado, the type locality for which it is named.[1][2] It is the Ni2+ analogue of zemannite.[3][4]
References
[edit]- ^ a b "Keystoneite". www.mindat.org. Retrieved 2026-03-07.
- ^ "Keystoneite Mineral Data". webmineral.com. Retrieved 2026-03-17.
- ^ Keystoneite (PDF), Mineral Data Publishing
- ^ Missen, Owen P.; Back, Malcolm E.; Mills, Stuart J.; Roberts, Andrew C.; LePage, Yvon; Pinch, William W.; Mandarino, Joseph A. (March 1, 2021). "Crystal Chemistry of Zemannite-Type Structures: III. Keystoneite, the Ni2+-Analogue of Zemannite, and Ferrotellurite Discredited". The Canadian Mineralogist. 59 (2): 355–364. doi:10.3749/canmin.2000009. ISSN 1499-1276.
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