Amethyst Stalactite Slice from Uruguay Korite Some remnants of matrix mineral

Some remnants of matrix mineral on one side and the core of the cluster has feldspar

which was used by the ancient Egyptians to adorn their most precious treasures

Size: 61 x 35 x 7 mm

That color mix — cyan fluorescence with greener afterglow - is consistent with Mn-activated calcite with minor secondary activators and

Amethyst Stalactite Slice from Uruguay Korite Some remnants of matrix mineralAmethyst stalagmite stalactite slice from Artigas, Uruguay. Size: 61 x 50 x 5 mm. 28 grams Amethyst stalagmite slices are a type of mineral formation that occur when water containing dissolved silica and iron flows over the ceiling of a cave and forms icicle like structures. The iron gives the stalagtites a purple hue, while the silica crystallizes into quartz. When these stalagmites are cut into thin slices, they reveal a beautiful pattern of