Quartz set

specimen number:
2063632

location:
Thunder Bay, Ontario, Canada

description:
A set of two quartz crystals, these mostly deep purple in color. The larger crystal has a colorless cap. In great condition, size provided for the larger of the two crystals.

Situated along the northern shore of Lake Superior, Thunder Bay, Ontario, is famous for its Proterozoic geological formations, particularly the Sibley Group sedimentary rocks where rich deposits of quartz formed in faults and fractures around 1.1 billion years ago during Midcontinent Rift tectonic activity. Hydrothermal fluids rich in silica and iron percolated through these fractures, depositing vibrant purple amethyst crystals in open cavities, with iron impurities and natural radiation giving the mineral its distinctive coloration. Indigenous peoples first discovered and utilized regional stone materials thousands of years ago, but commercial mining and widespread mineral collecting began in earnest during the mid-20th century following the accidental discovery of major veins during road construction in 1955. Today, the area hosts several active open-pit mines where collectors and tourists can dig for world-class amethyst specimens, making the vibrant gemstone the official mineral emblem of Ontario and a cornerstone of local heritage.

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