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V. V. Alekhina
V. V. Alekhina
Student, research assistant
G.V. Plekhanov Saint Petersburg Mining University
Student, research assistant
G.V. Plekhanov Saint Petersburg Mining University

Articles

Geology
  • Date submitted
    2001-06-14
  • Date accepted
    2001-07-30
  • Date published
    2002-01-01

Prerequisites for the ennoblement of garnet from the new manifestation of the Polar Urals

Article preview

The work is devoted to a rare and most valuable variety of garnet - demantoid. In mineralogical directories, the color of demantocetz is described in the range from emerald green to chocolate and tobacco, and its price changes accordingly. Materials for this work were our own field observations and samples collected at a new manifestation of garnet in the Polar Urals. The laboratory researches have shown, that the selected crystals, probably, are andradite-demantoid, though the majority of grains are characterized mainly by yellowish shades. In some cases, heterogeneity in coloring was noted - emerald green center and yellowish periphery of crystals. In spite of the high dispersion, the strong yellowish or even brown coloring does not allow counting on the commercial success of the found fan as an ophanous raw material. Assuming that the coloring zoning is caused by the oxidation of iron in the mineral, it seems reasonable to try to change the color of the garnet by reduction of iron. Thus, there are mineralogical prerequisites for experiments to change the color of garnet, which, if successful, may lead to a significant increase in the value of jewelry raw materials.

How to cite: Alekhina V.V. Prerequisites for the ennoblement of garnet from the new manifestation of the Polar Urals // Journal of Mining Institute. 2002. Vol. № 1 150. p. 10-13.
Forecasting and prevention of emergencies and their consequences
  • Date submitted
    2000-10-07
  • Date accepted
    2000-11-13
  • Date published
    2001-05-01

Geodynamic and other natural factors of the ecological state of Russia's geological environment

Article preview

Natural processes with negative impacts on the natural environment and human life safety are widely manifested on the territory of Russia: endogenous (seismic hazard) and exogenous (mudflows, avalanches) geodynamic phenomena, as well as the accumulation of anomalous concentrations of toxicants in geological bodies.

How to cite: Smyslov A.A., Marchenko A.G., Kulachkov L.V., Botalova E.A., Tutakova A.Y., Alekhina V.V., Baranauskaite I.A. Geodynamic and other natural factors of the ecological state of Russia’s geological environment // Journal of Mining Institute. 2001. Vol. № 5 149. p. 271-274.