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:
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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