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Antimony is stable in air at room temperature, but reacts with oxygen if heated to produce antimony trioxide, Sb Antimony is a silvery, lustrous gray metalloid with a Mohs scale hardness of 3, which is too soft to make hard objects; coins of antimony were issued in China's Guizhou province in 1931 but the durability was poor and the minting was soon discontinued. Four allotropes of antimony are known: a stable metallic form and three metastable forms (explosive, black and yellow).
The book Currus Triumphalis Antimonii (The Triumphal Chariot of Antimony), describing the preparation of metallic antimony, was published in Germany in 1604.
Antimony compounds are prominent additives for chlorine and bromine-containing fire retardants found in many commercial and domestic products.