Since 2013 – From Collectors for Collectors
| Chemische Formel | KFe2+3[(OH,F)2|AlSi3O10] | |
| Familie | Glimmer | |
| Farbe | schwarz, braun | |
| Härte | 2,5-3 | |
| Kristallsystem | monoklin | |
| Glanz | Glasglanz;Perlmutglanz | |
| Form | tafelig, blättrig | |
| Typlokalität | Massachusetts | |
| Weitere Fundorte | Kanada, Norwegen, Russland, Connecticut | |
| Bildung | Metamorphose, Magmatisch | |
| Paragenesen | Sodalith, Cancrinit, Zirkon, Calcit | |
| Pseudomorphose | ||
| Toxizität |  ungiftig | |
| Strichfarbe | weiß | |
| Mineralklasse | Silikate | |
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