Anhydrous arsenate with hydroxyl
Specific gravity: 4.15
Streak: Light brown
Colour: Chocolate brown to chestnut-brown; brown in transmitted light
Solubility: Soluble in acids.
Retzian is an extremely rare arsenate.
At the type locality, the Moss mine, Filipstad, Värmland, Sweden, retzian occure in cavities in dolomite, associated with pyrochroite and jacobsite.
At the Sterling Hill Mine in Ogdensburg, New Jersey, retzian-(Nd) is found with rhodochrosite, willemite, sonolite, calcite, baryte and chlorophoenicite in three separate parageneses. Retzian-(La) occurs as overgrowth crystals and embedded in light brown rhodochrosite in the willemite-franklinite ore.
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