What is plaster made of

The main component of gypsum is the hydrate of calcium sulfate (CaSO4). Gypsum is a monoclinic mineral. It is a widely used industrial and building material. It can be used for cement retarder, gypsum building products, model making, medical food additives, sulfuric acid production, paper filler, paint filler, etc.

What is plaster made of

Gypsum is divided into raw gypsum and anhydrite:

1. Raw gypsum is calcium sulfate dihydrate, also known as dihydrate gypsum, hydrated gypsum or soft gypsum. The theoretical composition is cao32.6%, so346.5%, H2O + 20.9%, monoclinic system. The crystal is plate-shaped, usually dense block or fibrous, white or gray, red, brown, glass or silk luster, Mohs hardness is 2, cleavage is parallel {010} complete, and density is 2.3g/cm3.

What is plaster made of

2. Anhydrite is anhydrous calcium sulfate, with theoretical composition of cao41.2%, so358.8%, orthorhombic system. The crystal is plate-shaped, usually dense block or granular, white and gray white, glass luster, Mohs hardness of 3 ~ 3.5, parallel cleavage {010} complete, and density of 2.8 ~ 3.0g/cm3.

Two kinds of gypsum are often produced together and can be transformed into each other under certain geological processes.

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