Bromargyrite

bromargyrite

chlorargyrite

iodargyrite

atacamite

Formula: AgBr
Normal halide, chlorargyrite group
Specific gravity: 6.474
Hardness: 2½
Streak: White to yellowish white
Colour: Yellowish, greenish brown, bright green
Melting point: 434oC
Common impurities: Cl,I

Hydrothermal environments

Bromargyrite is a rare secondary mineral in the oxidation zones of silver deposits, notably in arid regions. Associated minerals include atacamite, cerussite, chlorargyrite, iodargyrite, jarosite, limonite, malachite, pyromorphite, silver, smithsonite and wulfenite (Mindat, HOM).

Localities

At the Iodide Mine, Mineral Hill field, Condobolin district, Kennedy county, New South Wales, Australia, chlorian bromargyrite has been found in earthy, orange-yellow goethite and plumbojarosite rich gossan with kaolinite as a frequent associate. It also occurs in another portion of the mine as small crystals to 0.05 mm associated with malachite, azurite, bindheimite, cerussite and anglesite, in vugs in quartz (AJM 11.2.109-110).

At the Kintore opencut, Broken Hill South Mine, Broken Hill, Broken Hill district, Yancowinna county, New South Wales, Australia, bromargyrite is the rarest of the silver halide minerals here. It has been found with coronadite and white dolomite, with iodargyrite, and as bright yellow crystals to 7 mm with coronadite and iodargyrite (AJM 3.1.34).

At the type locality, Plateros, Zacatecas, Mexico, bromargyrite occurs in the oxidation zone of a silver deposit (Mindat).

At the Ambed No. 2 Mine, Ambed, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco, in the gossan zone there are thick masses of limonite intergrown with quartz, rich in brochantite and conichalcite and also containing adamite and austinite. Bromargyrite occurs as brightly lustrous yellow-orange interstitial fillings (Minrec 38.5.363).

At Bisbee, Cochise County, Arizona, USA, bromargyrite occurs occasionally in cuprite nodules (Minrec 43.1.supplement p 14).

At the Gallagher Vanadium & Rare Minerals Corporation Mine and Manila Mine, both in Cochise county, Arizona, USA, bromargyrite – bromian chlorargyritechlorargyrite minerals are widespread on both dumps although never in great abundance. They form individual crystals and irregular crusts on iron-manganese stained quartz, baryte and anglesite (R&M 90-4.342).

At the Reward Mine, Reward, Russ Mining District, Inyo Mts, Inyo county, California, USA, crystals of bromargyrite to 1.5 mm have been found on white, microcrystalline, drusy quartz, cerussite and plattnerite. The bromargyrite contains significant amounts of chlorine (Minrec 41.2.182).

At the San Rafael Mine, Quartz Mountain camp, Lodi Mining District, Lodi Hills, Nye county, Nevada, USA, bromargyrite and chlorargyrite occur sparingly as somewhat corroded and hoppered single crystals to 0.5 mm within spongy mimetite - anglesite - bayldonite masses (R&M 85.6.516 ).

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