Was inspired when going to a crystal/rock/gemstone exhibit. Wanted something that looked a little more natural so I combined a couple different existing files on printables and adjusted the sizes to work better together. 

They were primarily designed to be printed in dual color. Crystal being a translucent PETG like clear and the rock a different color. When printed like the 3MF file you can light them from the bottom and the crystals will glow. 

The files attached are different sizes in inches along with a 3MF file for printing two color on a MK3S+ and a MMU3 in PETG.  

Print Settings:

Layer Height: 0.2 mm

Infill: 15 percent

Top: 4

Bottom: 3

Perimeter: 3