Abstract
Natural calcite crystals containing Mn 2+, were collected from three different genetic assemblages — hydrothermal, sedimentary and metamorphic — and examined for their thermoluminescence characteristics and possible correlation with geological envrironments of formation. Features appearing in their natural and artificially induced TL glow curves seem to indicate roughly the relative temperatures of formations. The TL sensitivity of the sample of hydrothermal origin is the highest among the three samples studied, although it has the lowest concentration of the TL emitting centres, viz. thhe manganese impurity.
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