Mystic Quartz is a gem engine from Keystone Railway.
Mystic Quartz is a very friendly engine and is always quick to make friends.
Mystic Quartz is painted lavender with rainbow colored lining and her rainbow colored gem on her coal bunker.
- There are differences in the appearance of her gemstone between A Keystone Trip and Rainbow Colored Friends:
- It changes in colour from a rainbow to pink, purple, and blue.
- The shape of the facet changes from diamond to a pentagon
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