Minerals with Cross-Polarized Light

Using some minerals samples that we had lying around at work and low budget tools (my fingernail to scrape off pieces of the minerals), I looked at crystal structures with a cross-polarized light Foldscope (see this post for instructions). First, some muscovite mica which forms in very thin sheets and has high birefringence (which is what…

Does a Cigarette filter do anything?

Summary: I wanted to see what cigarette filters look like, and could I actually visualize the pore size to determine if they are capable of filtering anything. I often walk around looking at all the cigratte butts littering the streets. It is an object that is everywhere – and shows up as non-degradable waste around…