Evaporates are found where there is water, such as soil. Three common evaporate minerals found in soil are Anhydrite, Mirabilite, and Thenardite.

When aniline is treated with sulfuric acid, it becomes sulfate salt. The formula for this is Na2So4. It may also be known as thenardite or Glauber's salt.

Sodium does not exist simply as a metal in nature - it's too reactive, so it is found as a compound. Sodium is the sixth most abundant element in the earth's crust at about 2.6 - 3.0%. The most common mineral is rock salt (sodium chloride, NaCl, or halite), but it occurs in many other minerals including sodium borate (borax), sodium carbonate (soda), sodium nitrate (Chile saltpetre). and sodium sulphate (thenardite).

Na2O stands for Sodium Oxide.

Na - Sodium

O - Oxygen

In general, sedimentary rock crystals would be crystals that are found in sedimentary rocks. Normally they are calcite or quartz as they are the minerals most likely to cement sediments to form sedimentary rocks. There is a group of sedimentary rocks called evaporites that include crystals of salt, gypsum, sylvite, glauberite, thenardite, mirabilite and a few others.

However, there is a tremendous variety of other minerals that can produce crystals in sedimentary rocks. Geodes from Indiana, Illinois, and Kentucky can have crystals of barite, millerite, sphalerite, galena, fluorite, and aragonite. In other areas of the planet crystals of azurite and malachite can be found in sedimentary rocks. There are many, many other types of crystals that have been found in sedimentary rocks.