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phosphogypsum
phosphogypsum n.
Brit. 
/ˌfɒsfə(ʊ)ˈdʒɪps(ə)m/
, /ˌfɒsfə(ʊ)ˈdʒɪps(ə)m/U.S. /ˌfɑsfoʊˈdʒɪpsəm/
an impure form of gypsum, contaminated mainly with phosphate, which is a by-product of the industrial production of orthophosphoric acid from phosphate rock./ˌfɑsfoʊˈdʒɪpsəm/ΘΚΠ
society > occupation and work > materials > raw material > mineral material > [noun] > gypsum > type of
terra alba1871
phosphogypsum1954
1954 Industr. & Engin. Chem. 46 453/1 The regeneration of sulfuric acid from the by-product calcium sulfate, called phosphogypsum.
1983 New Scientist 16 June 760/1 Yellow sludge (phosphogypsum) is produced when phosphate rock is treated with sulphuric acid to make fertiliser.
2001 S. Roaf et al. Ecohouse (2002) vi. 141 It must be natural gypsum, not phosphogypsum, which is radioactive.
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