Small similar to 5 cent piece size.  Rhyolite ignites the potential and creativity of the soul.  It facilitates change without enforcing it, assists in fulfilling quests and facilitates knowing from a soul level.  It can access karmic wisdom.  Strengthening soul, body, and mind, Rhyolite is immensely helpful when exploring the full extent of the self.*
Please note: Our image is an example of the crystal you have selected and ordered.  You will receive a crystal of equal quality and size to the representation.  For those crystals with significant colour variation, please send me a message as to any particular colour preference so that I can try and fulfil your request personally.
* Judy Hall "The Crystal Bible" 2009