It sounds like what you found is not a typical paperweight, even though estate sale boxes often contain glassware meant for decorative purposes. Based on your description:
- Spiked glass lump
- Very heavy
- Sharp points
This is more likely to be a Glass Paperweight with Spikes / Decorative Sculpture made as a decorative art object rather than functional glassware. Some glass artists create these “spiked” or “spiky lumps” purely for aesthetic purposes.
Here are some possibilities:
1. Decorative Glass Sculpture
- Hand-blown glass sculptures sometimes have protrusions or spikes.
- Meant to catch light, act as a centerpiece, or showcase artistic skill.
2. Spiked Paperweight or Desk Ornament
- While some paperweights are smooth, art glass paperweights can have spikes or bubbles.
- The weight would help hold papers, though the sharp points make it impractical for daily use.
3. Functional Object?
- Less likely: It doesn’t sound like a drinking glass, vase, or bowl.
- Sharp points make it unsafe as functional glassware.
Safety Tips
- Handle with care—the spikes are sharp and can cut skin.
- Consider displaying it in a shadow box, on a shelf, or inside a protective case.
- Don’t try to use it as a paperweight if it’s very sharp—it’s likely meant as decorative art.
If you want, I can help you identify the style, age, and possible value of this spiked glass piece—it could be collectible depending on the maker. Do you want me to do that?