Use the winch. Click the winch hook, then walk over and click the crystal.
When you reach the purple crystal, use the winch to pull it out of the ground. Follow the light beam it projects to where it crosses the other beam, and dig there.
You turn them purple.
Lunar Colony
You don't use one on the Purple Monolith. Use the rover's winch as you did with the meteorite, to pull the surface rocks away.
There are no guards at all on Lunar Colony. PASE doesn't have any money in the budget.
well randerlize your self
To enter the Rock lab, you need a keycard (dropped by Salerno when you find her) and purple eyes that you can get from the machine in the Research Lab.
The yellow artifact (gem tower) is just above the Research Lab in the upper right of the lunar map. However, there is no value in going to it. The Red artifact is below the BioDome, and the Green artifact is just below the main lunar base.
The Purple Artifact is actually just slightly below the Rock lab on the map and can be seen as a faint purple glow. But you cannot do anything with it until you have the Geiger Counter from the Rock Lab.
Lunar Colony became the 29th island released in Poptropica (not counting mini-quests) on September 6, 2012.
It is on the back of the lunar rover. To use it, click it and carry the hook to where you need it.
After you chase her to the Rock lab, you can't find her again. When you use the Geiger Counter to find the Purple Artifact, she catches up to you.