Hi Vishwas, that particular crystal is a merlin, it is 2.7 kg and 26cm in height, with a 24cm circumference, so its rather a biggy and hard to work with.
If you were thinking of trying to get a merlin crystal then I would suggest that it might be better to start with a clear quartz crystal, preferably natural unpolished, uncut, and one that fits in the palm of your hand so that you can easily carry it around without getting arm strain lol. I guess it really depends on why you would want the crystal as to what kind to get? I always prefer people to choose intuitively, from their instinct and not from reading the properties of a stone. Sometimes our ego can choose for us and it may not tbe the right crystal or the right time. Now, thats not to say that a merlin generator isn't for you, they can be a wonderful tool of progression. Perhaps search 'generator' crystals and see what you feel about them. A generator is one with the 6 faces, grr its hard to get good pics, I'm a lousy photographer lol. You most probably will find the perfect generator crystal for you in a local shop or store and it will probably not be labelled asuch. Many bargains are to be had
These are all 'merlin' crystals so you can see the variety around
