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Upcoming Rockhounding Events in Montana Sapphire (Corundum) Streak: Colorless Hardness: 9 Chemical Formula: Al₂O₃ Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminum oxide with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium. It is typically blue, but natural sapphires also occur in yellow, purple, orange,…
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