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Tetraferriannite
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| Mineral: | Tetraferriannite: K(Fe++,Mg)3(Fe+++,Al)Si3O10(OH)2 | ||||
| Comments: | Brownish black crystal fragment of tetraferriannite showing the micaceous cleavage. | ||||
| Location: | Bancroft District, Hastings Co., Ontario, Canada. | ||||
| Scale: | Sample Size 1 cm. | ||||
| Copyright: | © Jeff Weissman / Photographic Guide to Mineral Species | ||||
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