Self-ignited burning coal known in the area at least since Alexander the Great came through Yagnob River Valley on his way to India.
Currently there are two main locations where coal is burning more or less close to the surface. One is on right shore of Yagnob River about 1 km upstream of former Ravat Kishlak (Village), in
Kukhi-Malik area. Another is on the right shore of Yagnob River near its confluence with Gaberud stream. There are a number of small coal burnings in the area producing at that stage mostly liquid or semi-liquid organic products.
References
Novikov V.P., Suprychev V.V.(1986) Parameters of modern mineral-forming processes associated with underground coal combustion at Fan-Yagnob deposit. Mineralogy of Tajikistan, 7, 91-104 (in Russian).
Belakovskiy D.I., Moskalev I.V.(1988) Natural ammonium nitrate from the products of self-ignited coal layers in Kukhi-Malik valley (Central Tajikistan). Novye dannye o mineralakh (new data on minerals), 1988, v.35, p.191-194. (Russian)
Belakovskiy D.I., Novikov V.P., Pautov L.A., Suprychev V.V. (1988): First occurrence of letovicite in the USSR (Central Tajikistan) Doklady Akademii Nauk Tadzhikskoy SSR, ХХХI, N 9., 603-606 (in Russian).
Belakovski D. (1990): Die Mineralien der brennenden Kohleflöze von Ravat in Tadshikistan. Lapis, 15 (12), 21-26. (in German)
Belakovskiy D.I., Galuskin E. (1990) Hopper crystals of natural salammoniac. Mineralogitceskiy Zhurnal, 12, xx-xx. (in Russian).
Nasdala L., Pekov I.V. (1993) Ravatite, C14H10, a new organic mineral species from Ravat, Tajikistan. Eur. J. Mineral., 5, 699-705.
Mineral List
21 entries listed. 19 valid minerals. 1 type locality (valid mineral).
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