A blue miracle: How sapphires formed in volcanoes

ScienceDaily
Jul 29, 2024, 5:34 pm172 pts
Sapphires are among the most precious gems, yet they consist solely of chemically 'contaminated' aluminum oxide, or corundum. It is widely assumed that these crystals with their characteristically blue color come from deep crustal rocks and accidentally ended up on the Earth's surface as magma ascended.…

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