Selenite (mineral) was filled with mineral-rich water that drove the crystals' growth. The largest of those crystals weighs 55 tons, is long, and is over 500,000 years old. Gypsum occurs on every continent and is the most common of all the sulfate minerals. Gypsum is formed as an evaporative mineral, frequently found in alkaline lake muds, clay beds, evaporated seas, salt flats, salt springs, and caves. It is frequently found in conjunction with other minerals such as, copper ores, sulfur and sulfides, silver, iron ores, coal, calcite, dolomite, limestone, and opal. Gypsum has been dated to almost every geologic age since the
Mineral rights companies, or federal, state or local governments. Mineral estates can be severed, or separated, from surface estates. There are two main avenues to mineral rights severance: the surface property may be sold and the minerals retained, or the minerals may be sold and the surface property retained, though the former is more common . When mineral rights have been severed from the surface rights (or property rights), it is referred to as a "split estate." In a split estate, the owner of the mineral rights has the right to develop those minerals, regardless of who owns the surface rights because