yup, glass is about as inert a substance as you can get - one of the reason's it's used for containers of non-inert chemicals :) That said, "normal part of nat

yup, glass is about as inert a substance as you can get - one of the reason's it's used for containers of non-inert chemicals :) That said, "normal part of nature" doesn't mean non-toxic. There are plenty of toxic things found lying around in nature.