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kalenangel

Dolomite/Quartzite test confusion

7 years ago

Back to the slab yard I went this morning, in search of a true quartzite. Last week I tested the Shadow Storm that was listed as a quartzite and it failed! Soy sauce stained it and it could not scratch glass (though it did not stain or etch from lemon juice, oil, ACV or ketchup).


So today I brought home two samples:


#1- Fantasy Blue Quartzite

#2 - Superior White Dolomite


I used ACV, lemon juice, ketchup and soy sauce for the tests. Let me first say that #1 Fantasy Blue "Quartzite" could not scratch glass, but I know many times the Fantasy Brown is found to be a marble as well, so I kinda expected it. But what I didn't expect was that nothing stained or etched it??? But dragging a fork across the top left serious scratches.


The #2 Superior White Dolomite dug into the glass pretty deep, making scratches you could feel with your nail. Does that mean it is a quartzite??And nothing stained it.....but EVERYTHING etched it! All four liquids left defined textures changes.


Rock experts, any thoughts on the results?



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