These beautiful towers are Selenite crystal.

The large tower is 30cm in height with 7 chakra crystal tumbles
The medium tower is 15cm in height 
The small tower is 10cm in height 
 
Selenite is a calming crystal that instils deep peace and is excellent for meditation or spiritual work. It has a very soothing and calming presence. 

Selenite crystal meaning is all about purification, clearing and positive energy.

Placing selenite in a room brings this beautiful energy into the room or carry and meditate with selenite to also receive these benefits. 

Selenite embodies a high vibration energy that works to help you to bring light down from the higher realms into the physical body, to create personal transformation. 

White or transparent crystals have a strong vibration that may open the crown chakra and the soul star chakra.