I decided to go looking for all the Purple Artifacts and memorise their locations. I posted this in case anyone esle would like to know. Here they are...

The Purple Artifact Fragment found outside the Quarantine Enforcement Platform.

Purple artifactt

Found in the Abandoned Seabase on the Floating Island.

Artifact 2

Found just above the Quarantine Enforcement Platform.

Artifact 3

Found in Mountain Island's cave system underwater.

Purple artifat 3

Found on the southern part of Mountain Island just outside one of the cave entrances.

Artifact 4

Found right above the main path to the Precursor Teleporter in Mountain Island.

Artifact 5

Found in the Quarantine Enforcement Platform.

Artifact 7

Found in the small cave system under the Quarantine Enforcement Platform's supports on the western side.