In order to retrieve the Quartz Chunk, you have to start "A Test of Faith". Make sure you find McGuinness north-east of Flatneck Station.

The Quartz Chunk will be received in the mail after mailing in the location of one dinosaur bone.

It can be used to craft the Bear Claw Talisman. The Legendary Bear Claw is also needed and a Silver Chain Bracelet.

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