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
Rondebosch Common Rondebosch Common Rondebosch Common is an open common of about in Rondebosch, Cape Town in South Africa. A common is defined as "A piece of open land for public use, esp. in a village or town." It contains one of the only surviving pockets of the critically endangered “Cape Flats Sand Fynbos” vegetation type, which exists nowhere else in the world. Rondebosch Common is a National Monument and an important conservation area for the critically endangered Cape Flats Sand Fynbos vegetation. This type of fynbos exists only in Cape Town, and has become critically endangered due to the urban development