Magnetic Properties of Glasses Synthesized from Rocks of Various Geneses

The mineral composition, petrographic structure, and magnetic properties of artificial glasses obtained from high-temperature melting of mixtures of rocks of various geneses (volcanic–sedimentary rocks, quartzite–shales, and psammite–silt–pelite complexes) are studied. When glasses were synthesized, cooling and glass transition conditions of various durations were used. The formation of ferrimagnetic minerals is due to the composition of the stock and the cooling rate of the melt. The resulting magnetic particles during “fast” cooling are mainly in the superparamagnetic state (up to 90% or more of the total amount of the magnetic phase in a sample). A mixture of particles of different sizes is formed during “slow” cooling and, as a result, in different magnetic states: from superparamagnetic to the low-domain state. The ferrimagnetic phase that crystallizes in artificial glasses is as chemically heterogeneous iron oxide aggregates, mainly non-stoichiometric magnetite.