Schiller is caused by the reflection of light
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Sedimentary rocks can take thousands to millions of years to form
Silicate minerals important class of rock-forming minerals
Oxygen and silicon make up about 75% of Earth's crust
Silicon dioxide occurs in nature as crystalline quartz
St Edward's sapphire in the Maltese Cross in the Imperial State Crown
Sterling silver often described incorrectly as solid silver
A streak test can be used to help identify certain minerals
Stromatolite from the Greek for 'layered rock'
The Stuart Sapphire mounted in the back of the Imperial State Crown
The Sweet Home Mine in Colorado famous for rhodochrosite
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