I would say it is not quartzite. Regardless, I would say no to this stone for a kitchen counter. It etches easily. Why are you asking about it once you found that out?

" Why are you asking about it once you found that out?"

Because love. Stoners love it when people fall in love with a particular stone, no matter its suitability as a countertop.

The unemployed bad boy who is in child support arrears with his two ex-wives leans against the bar as he orders his 10th drink of the night. But your daughter can change him; she's sure she can. He's so beautiful.

A true quartzite will not etch but it can stain. Certain quartzites are more porous than others and benefit from sealing. Like you I tested several samples that etched. I crossed them off of my list. I'd test your samples for staining too and do a search on here for the threads that detail quartzite staining so you know what to look out for before selecting a stone.

http://usenaturalstone.org/definitive-guide-quartzite/