Tourmaline inclusions in pyrite from Riphean terrigenous deposits of the Middle Timan

Abstract

The article presents novel information about tourmaline inclusions in pyrite from Riphean terrigenous deposits of the Middle Timan. The inclusions are predominantly small (up to 100 µm), belong to the alkaline group and the hydroxy-subgroup of the tourmaline supergroup. In chemical composition and Raman spectra they correspond to schorl, dravite; uvite and feruvite are less common. The nature of the relationship between tourmaline and pyrite, perfect short and long prismatic shape of the crystals, and the low degree of roundness suggest that they were formed at the time of pyrite crystallization.