Scored a box of glassware at an estate sale and this spiked glass lump was inside. It’s super heavy and the points are actually sharp. Is it a paperweight? What is this thing?

ability to blend seamlessly into the water at the bottom of a vase.
4. Clues In The Design: Weight, Spikes, And Hole Patterns Explained 
The design of a glass flower frog provides several clues to its function. Its weight ensures that it remains stable at the bottom of a vase, even when supporting a dense arrangement of flowers. The spikes, sharp and meticulously arranged, are critical to its use, providing numerous points of contact for securing flower stems.
Additionally, many glass flower frogs feature patterns of holes or indentations that coincide with the spikes, offering further anchorage for the flowers. These design elements are not just artistic but serve the practical purpose of facilitating the creation of balanced and aesthetically pleasing floral arrangements.
5. A Brief History Of Flower Frogs In Floral Arranging
Flower frogs have a long history in the art of floral arranging, with their origins tracing back