Sepiolite is a kind of chain and layered silicate.mineral containing water and enriched in magnesium, with its mineral veins generally being 2-3 centi- meters in thickness. Its fibres are usually several centimeters long and may even reach over ten centimeters. Various sorts of analyses were carried out by the author, including differential thermography; infrared spectrometry, X-ray diffraction, scanning electron microscopy and chemical analysis, showing the composition to be SiO2 56.16%，MgO 22.61% and H20± 17.88%.Following tectonic fragmentation, as a result of dissolution, the original do}omitic marble concentrated and precipitated its magnesium ions to form the mineral called sepiolite. Sepiolite finds wide application in different purpo$es, being now used as ion exchanger, absorbent, catalyst and sludge material .for deep geothermal and oil drilling.