Where Does Gypsum Come From?

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Calcium Sulfate Dihydrate (CaSO2H2O)

Regular use of gypsum is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodicity and salinity unless extreme care is taken. Gypsum is a key ingredient for the maintenance of agriculture on many types of soil and over a wide pH range, including sodicity. Gypsum, in addition to prevention and correction of sodicity, include: greater stability of soil organic matter, more stable soil aggregates, improved water penetration into soil, and more rapid seed emergence.


Is mined from the ground as a mineral and sold for industrial, medical and agricultural uses. Generally the mined gypsum will be selenite gypsum which is an opaque sandy crystal gypsum. There are various grades of gypsum and it is essential you determine you are getting the best bang for your buck. The easiest method of comparison is gypsum purity or each gypsum source available to you. Please follow the link for more info. 


Is derived from plasterboard waste and is a high quality source of gypsum. The product has a granular feel making it easier to spread. The granules porous structure increases the surface area making the recycled gypsum more soluble. Read more.


Industrial gypsum, FGD (Flu Gas Desulphurised Gypsum) and DSG (Desulphurised Gypsum) are all names for gypsum which are created by through chemical processes and not mined virgin product. Synthetic gypsum is most typically created in scrubbers, using lime (Ca), in coal fired power plants to clean the sulphur (SO) from the smoke stacks. The lime and sulfate combine and make synthetic gypsum (CaSO4· 2H2O) which is a high quality and very pure gypsum material. Chemically this gypsum is identical to natural gypsum.


Please follow the link for a comprehensive analysis on the major gypsum sources available on the eastern seaboard of Australia. This was compile to enable customers to compare gypsum purity, gypsum sizing, gypsum solubility and the salt content in the gypsum products. Gypsum Comparison Table.


Refers to the gypsum formed as a by-product of processing phosphate ore into fertilizer with sulfuric acid, such as Phosphate Hill in Central West QLD. REGYP DOES NOT SELL Phosphogypsum in Australia. Phospho gypsum is produced from the fabrication of phosphoric acid by reacting phosphate rock with sulfuric acid. Phosphogypsum does contain moderate levels of heavy metals including cadmium and REGYP recycled gypsum products DO NOT, so the two should not be confused. Phosphogypsum is radioactive due to the presence of naturally occurring uranium and radium in the phosphate ore. Marine-deposited phosphate typically has a higher level of radioactivity than igneous phosphate deposits, because uranium is present in seawater.