page_title: Ferrogedrite
hierarchical_section_title: Ferrogedrite
caption_attribution_description: English: Needles of ferro-gedrite on cleavage plane (001) of sekaninaite. Ferrogedrite is a product of weathering and decay of sekaninaite. From: Dolní Bory, Křižanov, Žďár nad Sázavou, Vysočina Region, Czech Republic.
context_page_description: Ferrogedrite is an amphibole mineral with the complex chemical formula of ☐Fe²⁺₂O₂₂(OH)₂. It is sodium and calcium poor, making it part of the magnesium-iron-manganese-lithium amphibole subgroup. Defined as less than 1.00 apfu of Na + Ca and consisting of greater than 1.00 apfu of separating it from the calcic-sodic amphiboles. It is related to anthophyllite amphibole and gedrite through coupled substitution of for and Al for Si. and determined by the content of silicon in the standard cell.
context_section_description: Ferrogedrite is an amphibole mineral with the complex chemical formula of ☐Fe²⁺₂(Fe²⁺₃Al₂)(Si₆Al₂)O₂₂(OH)₂. It is sodium and calcium poor, making it part of the magnesium-iron-manganese-lithium amphibole subgroup. Defined as less than 1.00 apfu (atoms per formula unit) of Na + Ca and consisting of greater than 1.00 apfu of (Mg, Fe²⁺, Mn²⁺, Li) separating it from the calcic-sodic amphiboles.  It is related to anthophyllite amphibole and gedrite through coupled substitution of (Al, Fe³⁺) for (Mg, Fe²⁺, Mn) and Al for Si. and determined by the content of silicon in the standard cell.
caption: Needles of ferro-gedrite on cleavage plane (001) of sekaninaite.
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