Arsenide mineral
Encyclopedia
An arsenide mineral is a mineral
that contains arsenide
as its main anion. Arsenides are grouped with the sulfides
in both the Dana and Strunz mineral classification systems.
Mineral
A mineral is a naturally occurring solid chemical substance formed through biogeochemical processes, having characteristic chemical composition, highly ordered atomic structure, and specific physical properties. By comparison, a rock is an aggregate of minerals and/or mineraloids and does not...
that contains arsenide
Arsenide
Arsenide is an arsenic anion with the charge −3. The trianion is formed by the reduction of arsenic by three electrons. For example heating arsenic powder with excess sodium gives sodium arsenide . The anions have no existence in solution since they are extremely basic...
as its main anion. Arsenides are grouped with the sulfides
Sulfide mineral
The sulfide minerals are a class of minerals containing sulfide as the major anion. Some sulfide minerals are economically important as metal ores. The sulfide class also includes the selenides, the tellurides, the arsenides, the antimonides, the bismuthinides, the sulfarsenides and the sulfosalts...
in both the Dana and Strunz mineral classification systems.
Examples
- algodoniteAlgodoniteAlgodonite is a copper arsenide mineral with formula: Cu6As. It is a gray white metallic mineral crystallizing in the hexagonal system. It has a Mohs hardness of 4 and a specific gravity of 8.38 - 8.72....
Cu6As - domeykiteDomeykiteDomeykite is a copper arsenide mineral, Cu3As. It crystallizes in the isometric system, although crystals are very rare. It typically forms as irregular masses or botryoidal forms. It is an opaque, white to gray metallic mineral with a Mohs hardness of 3 to 3.5 and a specific gravity of 7.2 to...
Cu3As - löllingiteLollingiteLoellingite, also spelled löllingite, is an iron arsenide mineral with formula FeAs2. It is often found associated with arsenopyrite from which it is hard to distinguish. Cobalt, nickel and sulfur substitute in the structure. The orthorhombic lollingite group includes the nickel iron arsenide...
FeAs2 - nickeline NiAs
- rammelsbergiteRammelsbergiteRammelsbergite is a nickel arsenide mineral with formula NiAs2. It forms metallic silvery to tin white to reddish orthorhombic prismatic crystals, but is usually massive in form. It has a Mohs hardness of 5.5 and a specific gravity of 7.1....
NiAs2 - saffloriteSaffloriteSafflorite is a rare cobalt iron arsenide mineral with formula: As2. Pure safflorite would be just CoAs2, but iron is virtually always present. Safflorite is a member of the three-way substitution series of arsenides known as the löllingite or löllingite group...
(Co,Fe)As2 - skutteruditeSkutteruditeSkutterudite is a cobalt arsenide mineral that has variable amounts of nickel and iron substituting for cobalt with a general formula: As3. Some references give the arsenic a variable formula subscript of 2-3. High nickel varieties are referred to as nickel-skutterudite, previously chloanthite...
(Co,Ni)As3 - sperryliteSperryliteSperrylite is a platinum arsenide mineral with formula: PtAs2 and is an opaque metallic tin white mineral which crystallizes in the isometric system with the pyrite group structure. It forms cubic, octahedral or pyritohedral crystals in addition to massive and reniform habits...
PtAs2