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Silver sulfide (or Silver sulphide in British English), Ag2S, is a black sulfide
Sulfide

The term sulfide refers to several types of chemical compounds containing sulfur in its lowest oxidation number of −2.Formally, "sulfide" is the dianion, S2−, which exists in strongly alkaline aqueous solutions formed from H2S or alkali metal salts such as Li2S, Na2S, and K2...
 of silver
Silver

Silver is a chemical element with the chemical symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it has the highest electrical conductivity of any element and the highest thermal conductivity of any metal....
. It is black and constitutes the tarnish
Tarnish

Tarnish is a layer of corrosion that forms over copper, brass, silver, aluminum, and other semi-reactive metals as they undergo oxidation. It is analogous to rust, but with a slower rate of occurrence....
 that forms on silver when exposed to the hydrogen sulfide
Hydrogen sulfide

Hydrogen sulfide is the chemical compound with the chemical formula Hydrogen2Sulfur. This colorless, toxic and flammable gas is partially responsible for the foul odor of egg and flatulence....
 of the atmosphere. It is found in nature as relatively low temperature mineral acanthite. The name argentite
Argentite

Argentite was primarily treated as a mineral belonging to the galena group, cubic silver sulfide , occasionally found as uneven cubes and octahedron, but more often as dendritic or earthy masses, with a blackish lead-grey color and metallic lustre....
 refers to a cubic form, which, due to instability in "normal" temperatures, is found in form of the pseudomorphosis of acanthite after argentite
Argentite

Argentite was primarily treated as a mineral belonging to the galena group, cubic silver sulfide , occasionally found as uneven cubes and octahedron, but more often as dendritic or earthy masses, with a blackish lead-grey color and metallic lustre....
.






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Silver sulfide (or Silver sulphide in British English), Ag2S, is a black sulfide
Sulfide

The term sulfide refers to several types of chemical compounds containing sulfur in its lowest oxidation number of −2.Formally, "sulfide" is the dianion, S2−, which exists in strongly alkaline aqueous solutions formed from H2S or alkali metal salts such as Li2S, Na2S, and K2...
 of silver
Silver

Silver is a chemical element with the chemical symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it has the highest electrical conductivity of any element and the highest thermal conductivity of any metal....
. It is black and constitutes the tarnish
Tarnish

Tarnish is a layer of corrosion that forms over copper, brass, silver, aluminum, and other semi-reactive metals as they undergo oxidation. It is analogous to rust, but with a slower rate of occurrence....
 that forms on silver when exposed to the hydrogen sulfide
Hydrogen sulfide

Hydrogen sulfide is the chemical compound with the chemical formula Hydrogen2Sulfur. This colorless, toxic and flammable gas is partially responsible for the foul odor of egg and flatulence....
 of the atmosphere. It is found in nature as relatively low temperature mineral acanthite. The name argentite
Argentite

Argentite was primarily treated as a mineral belonging to the galena group, cubic silver sulfide , occasionally found as uneven cubes and octahedron, but more often as dendritic or earthy masses, with a blackish lead-grey color and metallic lustre....
 refers to a cubic form, which, due to instability in "normal" temperatures, is found in form of the pseudomorphosis of acanthite after argentite
Argentite

Argentite was primarily treated as a mineral belonging to the galena group, cubic silver sulfide , occasionally found as uneven cubes and octahedron, but more often as dendritic or earthy masses, with a blackish lead-grey color and metallic lustre....
. When formed on electrical contacts
Contact

Contact means to touch physically or to communicate with.Contact may also refer to one of the things below....
 operating in an atmosphere rich in hydrogen sulfide, long filaments known as Silver Whiskers can form. Acanthite is an important ore of silver.

Structure

There are three forms , monoclinic acanthite, stable below 500°C, body centered cubic so-called argentite
Argentite

Argentite was primarily treated as a mineral belonging to the galena group, cubic silver sulfide , occasionally found as uneven cubes and octahedron, but more often as dendritic or earthy masses, with a blackish lead-grey color and metallic lustre....
, stable above 176°C, and a high temperature face centred cubic form stable above 586°C. The higher temperature forms are electrical conductors.

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