Opal Mystery

1. Plankton

1.1. The American Heritage Dictionary entry: plankton

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2. Plankton + bacteria

2.1. Fossil fuels

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3. Bacteria

3.1. Bacterium

3.1.1. The American Heritage Dictionary entry: bacterium

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4. Opal Mystery

4.1. Unlucky gem

4.1.1. Unlucky Opal - Jewelpedia

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5. Edwardian Black Opal Ring 1890 - 1900

5.1. `Erie Basin Blog

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6. Opal grinding

6.1. The dream OPAL comes true!

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7. Biggest Opal ever: 568 carats

7.1. The Largest and Most Significant Black Gem

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8. Dinosaur_bone + bacteria

8.1. The Opals of Australia documentary of Patrick Voillot

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8.5. Bacteria in a Dinosaur Bone Reignite a Heated Debate

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9. Oil not from dinosaur_bones

9.1. Does Oil Really Come From Dinosaurs?

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10. Opal colors

10.1. How Does Opal Get Its Color?

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10.5. Deffraction

10.5.1. The American Heritage Dictionary entry: diffraction

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11. Black Opal

11.1. About Black Opals | Opals

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12. Fake Opal

12.1. How to spot a synthetic opal: 3 tips

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