What is this blue crystal/stone? (Picture is below in an answer.) - Quora
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The 12 Most Common Blue, Violet, and Purple Minerals
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Lapis Lazuli: A blue gem used for cabochons, beads, inlay
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The 12 Most Common Blue, Violet, and Purple Minerals
Slate - Wikipedia
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The 12 Most Common Blue, Violet, and Purple Minerals
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K2 Granite: A white granite with azurite - AKA K2 Jasper
15 Different Types of Blue Rocks and Minerals (With Pictures) - Rock Seeker
