What sort of rock is this one?
closed as unclear what you're asking by Fred, Semidiurnal Simon, daniel.neumann, Trevor J. Smith, Gimelist Oct 28 '18 at 10:13
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If the second picture is under a black light, its most definite an indiction that the minerial is fluorite which fluoresce blue and violet. This and the moh hardness test should tell you more. Remember that a steel file has a hardness of 6.5 and fluorite a 4 so the file will scratch the mineral but not the other way. I believe that fluorite has a slight double defraction as well but this isnt always a good indicator since some amythest can appear cloudy. The hardness test should tell you.
While the photo is not the clearest... the colour, and what I am interpreting as conchoidal fracture, is certainly indicative of Amethyst, a variant of Quartz.