A superb, gemmy, sharp crystal of fluorite from this classic locality. When I grew up in the midwest, these were desired and traded like gems and considered a very rare fluorite to obtain. With time, they have only become more so. This is not only a sharp twin, but it is perfectly clear and gemmy, undamaged, and has a nice balance to fill space in a TN fluorite suite. As a bonus, it has small crystals of baryte on the bottom, and they show through the crystal and add visual interest and pattern.