Slavikite

slavikite

halotrichite

pickeringite

fibroferrite

Images

Formula: (H₃O)¹⁺₃Mg₆Fe³⁺₁₅(SO₄)₂₁(OH)₁₈.98H₂O
Valence: (H₃O)₃Mg₆Fe₁₅(S⁶⁺O₄)₂₁(OH)₁₈.98H₂O
Hydrated sulphate
Crystal system: Trigonal
Specific gravity: 1.905 to 1.99 measured
Hardness: 3½
Colour: Pale yellow, pale yellow-green
Environments

Sedimentary environments
Metamorphic environments
Hydrothermal environments

Slavikite occurs as an oxidation product of pyrite in shales and slate (Mindat).

Localities

At the type locality, Valachov Hill, Skřivaň, Pavlíkov, Rakovník District, Central Bohemian Region, Czech Republic, slavikite is an uncommon secondary oxidation product of pyrite in shales and slate. Associated minerals include halotrichite, pickeringite, fibroferrite, copiapite, melanterite, epsomite, jarosite and gypsum (HOM).
Slavikite from Valachov Hill - Image

At Varios Amigos Mine, Santa Cruz de Marchena, Almería, Andalusia, Spain, slavikite has been found (Mindat photo)
Slavikite from Varios Amigos Mine - Image

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