A piece of glass floats in a liquid with a density of 2.6 g/mL. Which type(s) of glass could it be?

Question:
A piece of glass floats in a liquid with a density of 2.6 g/mL. Which type(s) of glass could it be?
Answer:
Density/g/cm3
Explanation:
I don't exactly know how to explain but I'm pretty sure it's this.
Hope it helps! Sorry!