Large Emerald

Location: Arctic Spires Cache
Debug ID: precursorcachecrystal
Large Emeralds are mysterious green crystals found in the Arctic Spires Cache. The Architects used them in the manufacture of their technologies. Dialogue from Al-An hints that Large Emeralds may be one of the components required for making Ion Cubes.
Databank Entry
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Pure emerald is typically colorless; these large crystals contain trace amounts of chromium, leading to the development of the distinctive green color seen here.
Mining activity near these crystals suggests that they are valued for their applications in Architect technology.
Source: Scan
Gallery
Cluster of Large Emeralds
Inactive machinery harvesting the Emeralds
An emerald within a specimen case
A claw mechanism securing an Emerald in place