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Gemstones / Superhard materials / Abrasives / Nesosilicates / Oxide minerals / Rutile / Corundum / Pleochroism / Ruby / Chemistry / Crystallography / Matter
Gemstones
Superhard materials
Abrasives
Nesosilicates
Oxide minerals
Rutile
Corundum
Pleochroism
Ruby
Chemistry
Crystallography
Matter

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