A naturally occurring mineral consisting of calcium sulphate Gypsum is a flocculating agent for mushroom compost and is considered a conditioning agent Gypsum is used in compost to reduce its tendency to become greasy-a very undesirable condition
a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)
Represented by ( CaSO4,2H2O) is mixed with cement clinker during grinding Gypsum retards setting time of cement
Hydrated Calcium Sulphate Can form when limestone is attacked by sulphuric acid The resulting product is larger than its components so can be 'squirted' through pores in the rock under pressure, whilst in crystalline form