Phaseglass Needle

Phaseglass Needles are an Uncommon consumable material from Io. Players collect them by interacting with Phaseglass nodes on Io, similar to planetary materials in Destiny 1.

Uses

Give Phaseglass Needles to Asher Mir to raise your reputation with the Io faction. They also count toward an Io challenge that asks you to gather 10 Phaseglass Needles or Phaseglass Spires.

Farming

The Destiny 2 Wiki suggests the Nightstalker Hunter subclass with Keen Scout to reveal nodes on your radar when you are near them.