is it silica or black beauty
Well today i was a LFS and while looking around at the gravel section, i saw a container of black sand. This sand was shinny and sharp. It looked like what i've seen in pictures of black beauty sand blasting grit. I asked about it, and they told me that it was silica sand and would be a dollar a pound. My cell phone pouch has a magnetic clasp, so i took a pinch of this sand and sprinkled it over the magnet and it stuck to it.
So do you think this is black beauty as I suspect or is it black silica? I don't think silica would stick to a magnet but i've never actually used or seen either in person before.
I want a black sand for a cherry shrimp tank that i want to start. I'm not sure that I would want to use black beauty. I've been reading threads that say it's a by product of copper production, some threads say its iron slag. I'm just not sure it would be safe for shrimp.