The structure is monoclinic, with unit-cell parameters at 250 K: a = 0.675 nm, b = 1.195 nm, c = 1.465 nm, β = 95.1°, V = 1.177 nm3 with Z = 4. The most probable space group is P21/c. Magnesium selenate also forms an enneahydrate MgSeO4·9H2O, but with a different crystal structure. Natural occurrence
As Mg2+ and SO2−4 ions are respectively the second cation and the second anion present in seawater after Na+ and Cl−, magnesium sulfates are common minerals in geological environments. Their occurrence is mostly connected with supergene processes. Some of them are also important constituents of evaporitic potassium-magnesium (K-Mg) salts deposits. Bright spots observed by the Dawn Spacecraft in Occator Crater on the dwarf planet Ceres are most consistent with reflected light from magnesium sulfate hexahydrate.Almost all known mineralogical forms of MgSO4 are hydrates. Epsomite is the natural analogue of "Epsom salt". Meridianiite, MgSO4·11H2O, has been observed on the surface of frozen lakes and is thought to also occur on Mars. Hexahydrite is the next lower hydrate. Three next lower hydrates – pentahydrite, starkeyite, and especially sanderite – are rare. Kieserite is a monohydrate and is common among evaporitic deposits. Anhydrous magnesium sulfate was reported from some burning coal dumps. Preparation
Magnesium sulfate is usually obtained directly from dry lake beds and other natural sources. It can also be prepared by reacting magnesite (magnesium carbonate, MgCO3) or magnesia (oxide, MgO) with sulfuric acid (H2SO4).
Uterine inversion is when the uterus turns inside out, usually following childbirth. Symptoms include postpartum bleeding, abdominal pain, a mass in the vagina, and low blood pressure. Rarely inversion may occur not in association with pregnancy.Risk factors include pulling on the umbilical cord or pushing on the top of the uterus before the placenta has detached. Other risk factors include uterine atony, placenta previa, and connective tissue disorders. Diagnosis is by seeing the inside of the uterus either in or coming out of the vagina.Treatment involves standard resuscitation together with replacing the uterus as rapidly as possible. If efforts at manual replacement are not successful surgery is required. After the uterus is replaced oxytocin and antibiotics are typically recommended. The placenta can then be removed if it is still attached.Uterine inversion occurs in about 1 in 2,000 to 1 in 10,000 deliveries. Rates are higher in the developing world. The risk of death of the mother is about 15% while historically it has been as high as 80%. The condition has been described since at least 300 BC by Hippocrates. Signs and symptoms
Uterine inversion is often associated with significant postpartum bleeding. Traditionally it was thought that it presented with haemodynamic shock "out of proportion" with blood loss, however blood loss has often been underestimated. The parasympathetic effect of traction on the uterine ligaments may cause bradycardia.