Prediction of heterogeneity and anisotropy of oxidised pyrite crystals using electrical measurements

Abstract

ABSTRACT Some electrical, geochemical, and mineralogical investigations and analyses were made on some cubic oxidized Pyrite crystals (Gabal El-Sibai). Samples (chemically) are constituted from Fe2O3, SiO2, and Al2O3. Electrical features measured at frequency range (100 Hz– 5 MHz). Oxidized Pyrite crystals (cubes) are homogeneous, with no distortion or high variation in their composition. Also, samples have roughly the same structure. Samples were measured in 3-directions. It is supposed that any difference in a lattice structure, in any direction, will be reflected directly in the measurements, i.e. electrical features will attempt to detect variations of homogeneity and anisotropy of samples. The alterations in electrical functions are from mineral composition changes. Changes in texture, at specimens, do not exist (grain size and shape, mineral constituents, and pore throats between grains), and it is supposed that electrical features will be similar in three directions. There were some slight changes in electrical characteristics, due to some imperfections in natural crystals, with some impurities on crystal surfaces that we could not remove. Conductivity rises with frequency increase and accordingly, dielectric constant decreases. The paper aims to prove that the electrical properties, due to homogeneity, are the same at the three perpendicular directions.