Quartz (variety: Amethyst)
Resembling a monarch's scepter, this type of growth oddity is called scepterism. This specimen shows amethyst-topped rock crystal quartz. This happens when a second crystal (the amethyst) grew on top of the clear rock crystal after the rock crystal has stopped growing. The different color exhibited by the cap indicates secondary growth development. It due to different conditions, temperature, and chemical content of the environment upon which the two crystals formed.
Image Number: image C09-24/MSA 83