Conversation so far:
What is Columbia Hills?
The Columbia Hills are a range of low hills inside Gusev crater on Mars.
What happened when Spirit drove from Bonneville crater in a direct line to the Columbia Hills?
Within Hank's Hollow was the strange-looking rock dubbed Pot of Gold. After a detailed analysis with the AXPS-and the Mößbauer instrument it was detected that it contains hematite.

Question: Why is this significant?
Self-contained rewrite: Why is finding hematite significant?