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Formula: AgI
Iodide,
chlorargyrite group, forms a series with
marshite
Crystal System: Isometric
Specific gravity: 5.64
Hardness: 2½ to 3
Streak: Greenish yellow
Colour: Yellow
Solubility: Insoluble in dilute nitric acid; with dilute sulphuric acid and zinc decomposes to metallic silver plus copper (Dana)
Environments
Miersite is a rare mineral in the oxidised zone of some
lead–zinc–copper–silver
deposits, especially in arid regions
(HOM). It sometimes forms epitaxial intergrowths with iodargyrite
(Mindat).
Localities
At the type locality, Broken Hill, Broken Hill district, Yancowinna county, New South Wales, Australia, miersite is associated
with
iodargyrite, chlorargyrite,
malachite, limonite,
cerussite and cuprite
(HOM, Mindat).
At the Likasi Mine, Likasi, Kambove District, Haut-Katanga, DR Congo, miersite is associated with
gerhardtite and likasite
(HOM).
At the Mildren Mine group, Ko Vaya, Cababi Mining District, Comobabi Mountains, Tohono O'odom Indian Reservation, Pima county,
Arizona, USA,
miersite occurs as overgrowths on iodargyrite
(Dana).
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