Koninckite

koninckite

richellite

halloysite

allophane

Images

Formula: Fe³⁺(PO₄).3H₂O
Hydrated phosphate
Crystal System: Tetragonal
Specific gravity: 2.40 measured 2.56 calculated
Hardness: 3½ to 4
Streak: Pale yellow
Colour: Yellow; light yellow to colourless in transmitted light
Solubility: Readily soluble in hot hydrochloric or nitric acid
Common impurities: Al
Environments

Sedimentary environments
Hydrothermal environments

Localities

At the type locality, Richelle, Visé, Liège, Wallonia, Belgium, koninckite occurs as a secondary mineral in phosphatic sedimentary rocks. Associated minerals include richellite, halloysite and allophane (HOM, Mindat).

At the Suwa mine, Chino City, Nagano Prefecture, Japan, koninckite occurs in a hydrothermally altered andesite enriched in Fe, SO₄, and PO₄, associated with tinticite, strengite, jarosite and goethite (HOM).

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