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
Sanatoriums of the Caucasian Mineral Waters Sanatoriums of the Caucasian Mineral Waters The Caucasian Mineral Waters is a group of spa resorts protected by government ecological region in the Russian Federation. It includes the towns of Pyatigorsk, Zheleznovodsk, Yessentuki, Kislovodsk, Kumagorsk (Mineral Waters), and resort location of Naguta. The Caucasian Mineral Waters is a unique Russian resort complex that has no analogues on the European Asian continent. There are more than 115 sanatoriums, specializing in the treatment of various illnesses. This defined the Caucasian Mineral Waters as the main, composite, and versatile recreation area in Russia. This region is also famous for its beautiful landscape, mild