Joanneumite
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| Joanneumite | |
|---|---|
 Joanneumite (violet crystals), surrounded by salammoniac (fine-grained, blue-green mineral) | |
| General | |
| Category | Organic mineral |
| Formula | Cu(C3N3O3H2)2(NH3)2 |
| IMA symbol | Joa[1] |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) (same H-M symbol) |
| Space group | P1 |
| Unit cell | a = 5.042, b = 6.997 c = 9.099 [Å]; α = 90.05° β = 98.11°, γ = 110.95° |
| Identification | |
| Density | 1.97-2.02 (measured) |
| References | [2][3] |
Joanneumite, confirmed as a new mineral in 2012, is the first recognized isocyanurate mineral, with the formula Cu(C3N3O3H2)2(NH3)2.[4][5] Its crystal structure is identical to the structure of its synthetic analogue bis(isocyanurato)diamminecopper(II).[6] It is an ammine-containing mineral, a feature shared with ammineite, chanabayaite and shilovite.[7][8][9] All of these minerals are very rare and were found in a guano deposit in Pabellón de Pica, Chile.[10]
