Ungemachite

ungemachite

sideronatrite

metavoltine

fibroferrite

Images

Formula: K₃Na₈Fe³⁺(SO₄)₆(NO₃)₂.6H₂O
Hydrated sulphate
Crystal system: Trigonal
Specific gravity: 2.287 measured, 2.259 calculated
Hardness: 2½
Streak: White
Colour: Colourless, pale yellow; colourless in transmitted light
Solubility: Readily soluble in dilute hydrochloric acid
Environments

Hydrothermal environments

Localities

At the type locality, the Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta, Chile, ungemachite is formed rarely by the oxidation of pyrite in the arid climate, in veins and cavities in other massive iron sulphates. Associated minerals include clinoungemachite, jarosite, sideronatrite, metasideronatrite, metavoltine and fibroferrite (HOM).
Ungemachite from the Chuquicamata Mine - Image

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