THE ROLE OF CRYSTALLOMORPHOLOGY IN EVALUATION OF FLUORITE ORE DEPOSITION IN TAJIKISTAN A.R.Fajziev Tajik State University, Dushanbe, Tajikistan.

It is known that Tajikistan is among the regions with fluorite ore deposition. Tajikistan also poses mining enterprise which work out this ore from different deposits. Crystallography along with other means played an important role in investigation and evaluation of new fluorite deposits in Tajikistan. In the veining deposits we found the following vertical zones and distribution of habitus forms of fluorite crystals: in the upper horizons the crystals have cubic habitus, in the middle cubic octohedral and rhombododecahedral and in the lower horizons octohedral. The utilysation of the zonal system made it possible to oversee the prospectivity (unprospectivity) of a number of fluorite features. Here are also two examples:

Our investigation in Kara-jilga (Eastern Pamir) showed that the fluoride crystals on the surface are always of cubic forms, with additional {211} ,{311} ,{731} facets.

An opinion was expressed on this basis about not deep eroze section veins existing in this deposit and thus prospectivity of ore deposition in the deapth, which later on was proved by the results of our investigation: in the galleries of middle and lower horizons deposits,in the veins of crystals of fluorite of rhombododecahedrical and octobedrical habitus types were found.

In the ores of Fayzabad region (Central Tajikistan) the crystals of fluorite are only of octohedrial habitus types and it proves that the crystals here represent underroot parts (according to the scheme of changing the forms of crystals).

As it is really was found out during our future investigation compartively large veins ( tile 3 meters) and which are situated not very deep (35 - 40 meters) change into small veins and then completly wedge in.