Quartz

specimen number:
1115633

location:
Thunder Bay, Ontario, Canada

description:
An attractive cluster of lustrous quartz crystals, these purple and red. Minor micro-chipping present.

Thunder Bay, located along the north shore of Lake Superior in Ontario, Canada, is renowned for its vast deposits of amethyst, which was designated as the official provincial gemstone. Geologically, these occurrences formed within fault zones, fractures, and vugs in ancient Proterozoic rocks and associated granitic or volcanic host formations. Hydrothermal fluids circulating through these structures deposited macrocrystalline quartz, where trace amounts of iron combined with natural irradiation to produce the characteristic deep purple color, frequently accented by red hematite inclusions. Historically, while local prospecting and mineral collection occurred earlier, major commercial extraction and tourist operations began around the mid-20th century following road construction discoveries. Today, the region hosts North America's largest amethyst mines, celebrated both for commercial mineral production and public-access rockhounding.

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