What key mineral discovery by Spirit suggested a long-lived, possibly warm, aqueous environment on Mars?
Answer
Hydrated silica
While Spirit found several minerals indicative of water, the discovery of hydrated silica was particularly significant because its formation requires persistent liquid water, suggesting conditions that might have been sustained over time, possibly warm, rather than just brief or transient dampness. This evidence pointed toward a more stable aqueous environment existing in Gusev Crater. Although hematite spherules (blueberries) also indicated water action, hydrated silica provided stronger proof for a long-lived aquatic history necessary for potential habitability.
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