MBMG Mineral Museum, Butte: Free Rocks & Gems Guide
A 28-ounce gold nugget, glowing fluorescent rocks, and a 60,000-year-old cave bear — all free to see at Butte's Mineral…
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A 28-ounce gold nugget, glowing fluorescent rocks, and a 60,000-year-old cave bear — all free to see at Butte's Mineral…
Read Guide