Key quartz crystal have indentations on them left by another crystal. They help you unlock answers to questions you may have. 

Do you need help in accessing an answer which has previously been blocked to you? The energy of a Key quartz crystal can help you to find an easier, more direct way in.

Imagine this as easily opening the lock on the front door and walking right in (rather than having to check all the windows for one that is unlocked, climbing through, scraping your elbows and knocking your head).

Ease of access is what Key quartz crystal energy brings us.