Arsenic
Arsenic (unrefined arsenic) is a solid substance extracted from natural arsenopyrites.
It exists in two main forms:
a) ordinary, so-called "metallic" arsenic, in the form of brilliant steel-colored crystals, brittle, insoluble in water;
b) yellow arsenic, crystalline, fairly unstable.
Arsenic is used in the production of arsenic disulfide, shot, hard bronze and various other alloys (tin, copper, etc.)
Source: "Explanations to the Harmonized System of Foreign Economic Activity of the Russian Federation (HS FED)" "(Russia)" (prepared by the State Customs Committee of the Russian Federation) (Volume 1, Sections I - VI, Groups 1 - 29)