Selenite (satin spa) - you will get one sphere base only, very similar but not the exact piece from the photo.  Diameter is 7cm approx.  
Selenite often contains imperfections due to its softness. 
Selenite (satin spa) is commonly used for cleansing other crystals and does not need cleaning itself.
 
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Crystals are very unique and can include small inclusions and minor imperfections and slight variations in size, shape, colour and surface patterns. Colours may also vary on different devices.