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The Mineral bromargyrite

Translucent Green Bromargyrite

Bromargyrite is an ore of silver, and is very similar to Chlorargyrite, with which it forms a solid solution series. Bromargyrite contains the halogen bromine combined with silver, whereas Chlorargyrite contains chlorine with silver. Bromargyrite and Chlorargyrite can be visually indistinguishable from one another, and will often form in the same deposits. The intermediary mineral of this series, known as Embolite, is usually classified as a bromine-rich variety of Chlorargyrite. Bromargyrite and Chlorargyrite are also chemically similar to the rare mineral Iodargyrite, which has iodine in place of the bromine/chlorine.

Bromargyrite is named after its chemical composition: "brom" for bromine, and "argyros" for the Greek word used for silver.

Chemical Formula

AgBr

Color

Light to dark green, yellowish-brown to brown, butterscotch, light gray.

Crystal System

Isometric

Properties

Streak
White to yellowish-white
Hardness
1.5 - 2.5
Transparency
Transparent to translucent
Specific Gravity
5.7 - 6.0
Luster
Waxy, resinous, adamantine
Cleavage
None
Fracture
Uneven
Tenacity
Sectile and ductile

Crystal Habits

Individual crystals are very uncommon, and will be in cubic or partially modified cubic or dodecahedral form. Crystals are usually grouped together in crystal aggregates. Most often encrusting, grainy, drusy, massive, and in thick, coral-like growths.

Additional Information

Composition
Silver bromide, usually with chloride and less commonly iodide
In Group
Halides
Striking Features
Color and luster, mode of occurrence, high specific gravity, and sectility
Environment
As a secondary mineral in oxidation zones, forming in epithermal veins and hydrothermal replacement deposits of silver deposits.
Rock Type
Sedimentary

Other Names

Bromyrite

Varieties

 -   Bromium-rich variety of Chlorargyrite; an intermediary mineral of the Chlorargyrite-Bromargyrite series.

Uses

Bromargyrite is an ore of silver.

Noteworthy Localities

The most prolific locality for Bromargyrite is the famous silver mine at Broken Hill, New South Wales, Australia. Other important localities include Chañarcillo, Copiapó Province, Atacama Region, Chile; Plateros, Zacatecas, Mexico; the Blue Bell Mine, Baker, San Bernardino Co., California; and the Commercial Cramer Mine, Georgetown, Grant Co., New Mexico.

Common Mineral Associations

Chlorargyrite, Silver, Iodargyrite, Smithsonite

bromargyrite Photos



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