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Soapstone is a metamorphic rock, a talc-schist. It is largely composed of the mineral talc and is rich in magnesium. It is produced by dynamothermal metamorphism and metasomatism, which occurs at the areas where tectonic plates are subducted, changing rocks by heat and pressure, with influx of fluids, but without melting. It has been a medium for carving for thousands of years.
Steatite is relatively soft (because of the high talc content, talc being one on Mohs hardness scale), and may feel soapy when touched, hence the name.
One use of Soapstone is for kitchen countertops and sinks. Soapstone is sometimes used for fireplace surrounds because it can absorb and evenly distribute heat while being easy to manufacture.
Generally, suppliers of soapstone counter tops recommend the use of mineral oil to enhance the color of soapstone.
Soapstone naturally forms a patina over time, similar to the oxidization process that occurs with other materials like copper. A weathered or aged appearance will occur naturally over time as the patina is enhanced. Applying mineral oil will simple darken the appearance of the stone; it will not and does not protect it in any way. Mineral oiling is a strictly cosmetic process.
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