These are sometimes called a Crystal Tower. 

Best to amplify energy and your intentions.

They can be used to raise the vibration of location. 

Pointed Crystals are very powerful because they have the ability to transmit and emit energy from the point. Sometimes one end may be releasing energy while the other point is transmitting energy, other times both points may be transmitting or emitting energy. Because of this, they have many purposes, but should be used with care.

This powerful crystal enhances spiritual growth and protection. 

Also, known for bringing clarity of the mind to the owner. 

• Powerful aid to move into higher consciousness
• Cleanses the auric field
• Protection stone, guarding against psychic attack
• Well known for having a positive affect against insomnia and nightmares
• Place an amethyst crystal under your bed, to dispel nightmares and encourage lucid dreaming
• Use meditation to allow relief of stress and anxiety
• Cleanse regularly, to keep crystal energy straight forward

Makes excellent crystals for the central stone in any crystal grid.

 Chakra: Crown & Etheric (8^th and beyond, above head)

Element: Air

Approximately: 1.5"-2.5" Inches