This an Alum mineral created in the lab by Sokolowski Minerals of Poland.

You will get one random mineral very similar to the ones pictured.

Alum does grow naturally although it solvable in water. It is hydrated potassium aluminum sulfate with the formula KAI (SO4) x 12H20. Alum is used, for example, commercially in products to stop the bleeding process and the general healing process.  It is also used as a powder in the process of pickling to maintain the crispness of fruits and vegetables as well as in some backing powders. Another use of Alum is to be used as a flame retardant and it is used in some fire extinguishers  

Alum minerals should avoid direct sunlight because it might fade otherwise because the water inside the minerals will evaporate.