Sexually transmitted diseases (STDs) remain a major public health challenge in the U.S., especially among women, who. disproportionately bear the long-term consequences of STDs. For example, each year untreated STDs cause infertility in.
Chemically known as âcalcium sulfate dihydrate,â gypsum contains calcium, sulfur bound to oxygen, and water. Gypsum is an abundant mineral and takes forms including alabasterâa material used in decoration and construction as far back as ancient Egypt.hemically known as âcalcium sulfate dihydrate,â gypsum contains calcium, sulfur bound to oxygen, and water. Gypsum is an abundant mineral and takes forms including alabasterâa material used in decoration and construction as far back as ancient Egypt.
The water evaporated and left the mineral. Gypsum is composed of calcium sulfate (CaSO4) and water (H2O), i.e. Calcium Sulphate Dihydrate (CaSO4.2H2O). In Europe, the principal Gypsum quarries are located in Germany, UK, France, Spain, Italy, Poland, Russia and the Ukraine.