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This quiz is tied up with a rainbow! Can you earn that pot of gold? Or have you bitten off more than you can hue?

By Louise Molloy They’re very rare. They’re very fragile. They’re the amazing, fossil bearing rocks found at McGrath’s Flat in central NSW.

Welcome to Double Helix magazine’s Q&A section – Microscope. We take a close look at small questions full of big ideas. Q: What makes some plants have purple leaves? The Helix reader, Sudashree from South Australia