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Earth and the Environment
Minerals, Mining, and Metallurgy
Mineralogy and Crystallography
Mineralogy and Crystallography
quartz
realgar
Relaxation
riebeckite
rift
ruby
rutile
sapphire
scheelite
schlieren
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silky
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Research Categories
Earth and Environment
History
Literature and the Arts
Medicine
People
Philosophy and Religion
Places
Plants and Animals
Science and Technology
Social Sciences and the Law
Sports and Everyday Life
Additional References
Articles
Daily