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
Spa (mineral water) Spa (mineral water) Spa is a brand of mineral water from Spa, Belgium, and is owned by the Spadel Group. Spa mineral water has been bottled since the end of the 16th century and is very common in Western Europe and especially in the Benelux countries and Germany but is also exported to other parts of the world. Spa Mineral Water is distributed in the UK by Aqua Amore Ltd. Spa mineral water comes from the grounds of the Hautes Fagnes, of which the upper layers exists from heath land and peat. Spa mineral water is available in bottles of