Crystal is a common stone, but a powerful one. It is mainly used in healing as amplification for the energies of the other working stones. In healing, the crystal point is best and the size can be important. The Quartz Crystal has a similar vibration as humans. This is why using Crystal to meditate and keeping a Crystal helps one to know oneself. It will sometimes not work for a negative person.
Amethyst & Citrine are powerful crystals for inviting balance and spirituality into your home. Citrine is also known for attracting fortune and abundance.