Pectolite NaHCa2[Si3O9] has been known since the early 19th century. It is found in igneous rocks, in various parts of the world, including basalts, dolerites, and largely in alkalic rocks. We found pectolite in manganese ...
The paper deals with the use of the results of geophysical observations in areas of water to solve geological engineering, hydrogeological and geoecological problems. The measurement of natural electrical fields can be ...