单词	gypsum
释义	gypsum /ˈdʒɪpsəm / noun [mass noun] A soft white or grey mineral consisting of hydrated calcium sulphate. It occurs chiefly in sedimentary deposits and is used to make plaster of Paris and fertilizers, and in the building industry.Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and gypsum in gypsiferous sediments.... It is dominated by the deposition of calcite with minor pyrite, marcasite, barite, anhydrite and gypsum. Invisible traces of quartz, calcite, gypsum and feldspar, the dust of its resting place for more than two millennia, cling to the bronze. Derivatives gypseous adjective gypsiferous /dʒɪpˈsɪf(ə)rəs / adjective ... Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and gypsum in gypsiferous sediments. Some areas are mined for the underlying gypsiferous materials that is used for making wall board. The others include the gypsiferous deposits of Lake Estancia and Lake Trinity. Origin Late Middle English: from Latin, from Greek gupsos.
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