Celestite, 31,32 solubility

In the three simulations, the sulfate minerals form at mixing ratios related to their solubilities. Barite, the least soluble, forms early, when small amounts of seawater are added. The more soluble celestite forms only after the addition of somewhat larger quantities of seawater. Anhydrite, the most soluble of the minerals, forms from the Amethyst fluid at still higher ratios of seawater to formation fluid. 

Properties White precipitate or crystals of the mineral celestite odorless. D 3.71-3.97, mp 1605C. Slightly soluble in concentrated acids very slightly soluble in water insoluble in alcohol and dilute sulfuric acid. 

Derivation (1) Celestite is ground (2) precipitation of any soluble strontium salt with sodium sulfate. 

Pressure generally increases the solubility of minerals. An accurate evaluation of the pressure effect on solubility may require that we consider both molar volumes and compressibilies of reactants and products. In the following problem we compare the solubility of celestite (SrS04) in a surface water at 1 bar pressure and 25°C to its solubility in groundwater at 6000 ft depth at a temperature of 75 C and pressure of 180 bars. The reaction of interest is SrS04(celestite) = + SO ". To... 

Strontium Sulfate. Strontium sulfate, SrS04, occurs as celestite deposits in beds or veins in sediments or sedimentary rocks. Celestite has a specific gravity of ca 3.97, a Mohs hardness of 3.0—3.5, and is colodess-to-yellow and often pale blue. Strontium sulfate forms colorless or white rhombic crystals with a specific gravity of 3.96 and an index of refraction of 1.622—1.631. It decomposes at 1580°C and has a solubility of 0.0113 g per 100 mT, of water at 0°C. 

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