Images
Formula: YCu2+6(AsO4)3(OH)6.3H2O
Hydrated arsenate,
mixite group,
yttrium-bearing mineral
Crystal System: Hexagonal
Specific gravity: 3.61 to 3.72 measured, 3.66 calculated
Hardness: 3 to 4
Streak: Greenish white
Colour: Bluish green to yellow-green
Luminescence: Not fluorescent under UV
Environments
Agardite-(Y) occurs in the oxidation zone of some copper deposits.
Common associates include azurite,
chrysocolla, copper,
cuprite, malachite,
mimetite and quartz
(Mindat).
Localities
At the Monte Cervandone area, Devero Alp, Baceno, Verbano-Cusio-Ossola Province, Piedmont, Italy, agardite-(Y) has
been found as a green coating on cafarsite strongly resembling
malachite. Other specimens found exhibit greenish to blue-greenish,
radial-spherical aggregates of a few millimeters radius, composed of tiny acicular crystals of agardite-(Y).
The agardite-(Y) is a weathering product of cafarsite
(MinRec56.3.296).
At the type locality, the Bou Skour mine, Bou Skour mining district, Agdz Cercle, Zagora Province, Drâa-Tafilalet
Region, Morocco, agardite-(Y) occurs in the oxidation zone of copper
veins or deposits
(Mindat).
Agardite-(Y) from the Bou Skour Mine -
Image
Back to Minerals