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Mineralpedia Details for Metasideronatrite

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Metasideronatrite

Metasideronatrite

Named as a mineral relating to sideronatrite with lower hydration, hence the prefix meta-. Metasideronatrite is a rare mineral that occurs usually in arid climates as an uncommon alteration product of pyrite, but is also stably formed in environments around the sea. Metasideronatrite occurs in localities in Chile, the United States, Spain and Italy among just a couple others. Under appropriate conditions, Metasideronatrite can reversibly alter to sideronatrite depending on the humidity and exposure of the material to sunlight however it will completely decompose in boiling water.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/metasideronatrite.pdf

Formula
Na2Fe3+(SO4)2(OH)┬ĚH2
Crystal System
Orthorhombic 
Crystal Habit
Aggregates, Earthy, Nodular 
Cleavage
Perfect, Perfect, Distinct 
Luster
Silky 
Color
yellow, golden yellow, orange, pale brown 
Streak
pale yellow 
Class
Orthorhombic 
Hardness
1.5-2.5 
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Metasideronatrite from Copiapo, Atacama, Chile

Metasideronatrite
            from Copiapo, Atacama, Chile

Solid mass of fibrous, golden Metasideronatrite.

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