Images
Formula: Pb5(CrO4)2(PO4)2.H2O
Hydrated chromate
Crystal System: Monoclinc
Specific gravity: 6.45 measured, 6.564 calculated
Hardness: 3½
Streak: Yellow
Colour: Dull orange
Environments
Localities
At the Callenberg North open cut No. 1, Callenberg, Zwickau District, Saxony, Germany, embreyite is
associated with crocoite,
vauquelinite, fornacite,
pyromorphite, mimetite and
cerussite
(HOM).
Embreyite from Callenberg - Image
At the type locality, the Berezovsk deposit, Beryozovsky, Sverdlovsk Oblast, Russia, embreyite occurs on those
specimens rich in other chromates, particularly
crocoite and
phoenicochroite. It is later than
crocoite, which it may implant and replace, and was not observed in direct
contact with the still earlier phoenicochroite.
Cerussite is later than, and may replace embreyite.
Vauquelinite was also observed replacing embreyite directly.
Embreyite also occurs as thick botryoidal crusts.
The chromates at Berezov usually occurred in
gold-bearing quartz veins.
Pure embreyite is dull orange in colour, the streak is primrose yellow, the lustre may be dull to sparkling
and resinous, and crystalline material is transparent or transluscent in mass.
(MM 38.790-793).
Other associated minerals observed on museum samples from the oxidised zone of the
gold-bearing quartz veins include
cassedanneite
(HOM).
Embreyite from the Berezovsk deposit -
Image
Back to Minerals