Phoenicochroite

phoenicochroite

hemihedrite

vauquelinite

crocoite

Images

Formula: Pb2(CrO4)
Chromate
Crystal System: Monoclinic
Specific gravity: 7.01 measured, 7.075 calculated
Hardness: 2½
Streak: Brick red
Colour: Dark red
Solubility: Soluble in hydrochloric acid with separation of lead chloride
Environments:

Hydrothermal environments

Phoenicochroite is a rare secondary mineral in the oxidised zone of chromium-bearing hydrothermal lead deposits, associated with crocoite, vauquelinite, fornacite, hemihedrite, iranite, pyromorphite, mimetite, cerussite, leadhillite, galena, calcite, fluorite and quartz (AM55.784-792).
Phoenicochroite superficially alters to crocoite which is then replaced by cerussite, mimetite and vauquelinite (AM55.784-792).

Localities

At the type locality, the Berezovsk Mines, Ural mountains, Russia, phoenicochroite is associated with vauquelinite, pyromorphite, galena, crocoite (Mindat) and anglesite (Dana).
Phoenicochroite from the Berezovsk Mines - Image

At various localities in Arizona, USA, phoenicochroite occurs with mimetite, willemite, hemihedrite and vauquelinite (Dana).
Phoenicochroite from Arizone - Image

At the Potter-Cramer mine, Vulture Mining District, Maricopa county, Arizona, USA, phoenicochroite is rare; it and hemihedrite were the first chromates to form in the oxide assemblage at the mine (R&M 96.1.33).

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