Dims: 3.76x1.79x1.24" (9.56x4.55x3.16cm)
Wt: 6.16oz (174.6g)
This is an amethyst stalactite. I can imagine that the original stalactite formed above the water level in a cave system in what is now Uraguay, and later came to be filled with a saturated solution of quartz in water from which these crystals grew. While I am unsure of the original material, it appears that the bulk of the stalactite is a dark green-black agate, surrounded with a layer of colorless crystalline quartz, topped with the layer of purple amethyst. The color is moderately light for Uraguay amethyst. There is a moderate amount of damage, especially to one side that seems a bit flattened - it may have been in contact with another stalactite which limited its growth.