Since 2013 – From Collectors for Collectors
| Chemische Formel | Mn4+O2 | |
| Familie | ||
| Farbe | grau, schwarz | |
| Härte | 3 | |
| Kristallsystem | orthorhombisch | |
| Glanz | Metallglanz | |
| Form | faserig, nadelig, blättrig | |
| Typlokalität | New Mexico | |
| Weitere Fundorte | Griechenland, Arizona | |
| Bildung | Oxidationszone von Mangan-Lagerstätten, Dehydrierung aus Groutit | |
| Paragenesen | Pyrolusit, Groutit, Calcit | |
| Pseudomorphose | Groutit | |
| Toxizität |  ungiftig | |
| Strichfarbe | braunschwarz | |
| Mineralklasse | Oxide | |
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| Chemische Formel | Mn3+O(OH) | |
| Familie | ||
| Farbe | schwarz | |
| Härte | 3,5-4 | |
| Kristallsystem | orthorhombisch | |
| Glanz | Diamantglanz;Metallglanz | |
| Form | traubig, krustig, tafelig, prismatisch | |
| Typlokalität | Minnesota | |
| Weitere Fundorte | Deutschland, Portugal, Südafrika, Ukraine, Arizona | |
| Bildung | Sedimentär(Verwitterung), hydrothermal, Metamorphose (Graphit) | |
| Paragenesen | Calcit, Baryt, Vesuvianit, Hureaulith | |
| Pseudomorphose | ||
| Toxizität | ungiftig | |
| Strichfarbe | braun | |
| Mineralklasse | Hydroxide | |
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