there are 3 areas on my Taj Mahal quartzite that look like etching. They are literally 3 perfect rings of different sizes in different areas on my honed countertops. Given that quartzite is supposed to be resistant to etching + I’m the most careful person and barely cook or use acids or anything that would etch it, what could these possibly be? Just want to understand what it is and if I could’ve caused it to know how to prevent it.