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ARSENIC ORE

Arsenic ( /ˈɑrsənɪk/ ARS-ə-nik, also /ɑrˈsɛnɪk/ ar-SEN-ik when attributive) is the chemical element that has the symbol As, atomic number 33 and relative atomic mass 74.92. Arsenic was first documented by Albertus Magnus in 1250.[4] Arsenic is a notoriously poisonous metalloid. It can exist in various allotropes, although only the grey form is important in a technical sense. Arsenic occurs in many minerals, mainly associated with sulfur and metals. Arsenic and its compounds, especially the trioxide, are mainly used in the production of pesticides, herbicides, insecticides, but these applications are declining.[5] Arsenic is also a common n-type dopant in semiconductor electronic devices. The occurrence of arsenic in drinking water is problematic in some parts of the world.
Detailed distribution
 Occurrence and production
Minerals with the formula MAsS and MAs2 (M = Fe, Ni, Co) are the dominant commercial sources of arsenic together with realgar and native As. An illustrative mineral is Arsenopyrite (FeAsS), which is structurally related to iron pyrite. Otherwise many minor As-containing minerals are known.
In addition to the inorganic forms mentioned above, arsenic also occurs in various organic forms in the environment.

Other naturally occurring pathways of exposure include volcanic ash, weathering of the arsenic-containing mineral and ores as well as groundwater. It is also found in food, water, soil and air.The most common pathway of exposure for humans is ingestion, and the predominant source of arsenic in our diet is through seafood

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