Cave-in-Rock Fluorite District
📍 Illinois, United States · 37.6300°, -88.1800°
Illinois state mineral source — Cave-in-Rock purple-and-yellow fluorite with phantom zoning fed American industry until 1995 closure.
📍 Illinois, United States · 37.6300°, -88.1800°
Illinois state mineral source — Cave-in-Rock purple-and-yellow fluorite with phantom zoning fed American industry until 1995 closure.