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Unique Phosphosiderite on Stewartite from Portugal

Photography by Yaiba Sakaguchi.

Stewartite & Phosphosiderite

Phosphosiderite

Formula: FePO₄ · 2H₂O
System: Monoclinic
Colour: Purple to reddish ...
Lustre: Vitreous, Resinous
Hardness: 3½ - 4

Stewartite
Formula: Mn²⁺Fe₂³⁺(PO₄)₂(OH)₂ · 8H₂O
System: Triclinic
Colour: Yellow to brownish yellow
Lustre: Sub-Vitreous, Resinous, Silky

Locality: Regada, Cubos-Mesquitela-Mangualdearea, Mangualde, Viseu District, Portugal.

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