Opaline Silica On Mars
In the Gusev crater of Mars, the Mars Exploration Rover Spirit inadvertently discovered opaline silica. One of its wheels had earlier become immobilized and thus was effectively trenching the Martian regolith as it dragged behind the traversing rover. Later analysis showed that the silica was evidence for hydrothermal conditions.
Read more about this topic: Biogenic Silica
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“But in the dome of mighty Mars the red,”
—Geoffrey Chaucer (1340?–1400)