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1/19/2021 A Deep Dive Into the Properties of Quartzite-Use Natural Stone <br /> 2. Look for signs of cross bedding, which is common in sandstone but absent in highly- <br /> metamorphosed quartzites. <br /> 3.Test the porosity by setting the stone in water and observing if the stone soaks up <br /> water. <br /> Let's explore each of these geo-detective methods. Oh, and if your eighth-grader is looking <br /> for a novel science fair project, this would be a worthy one. Who knows, maybe this could <br /> spur your child to pursue the greatest career ever?(By that I mean geology, of course.) <br /> 1 . Do you see sand grains? <br /> The key difference between sandstone and quartzite is whether the stone is made of <br /> individual sand grains, or has been recrystallized to the point where the grains became <br /> tightly interlocked. <br /> Is it sandstone or quartzite? <br /> A magnified view can help tell them apart <br /> Sandstone Quartzite <br /> Individual sand grains visible No visible grains—the stone is <br /> (a magnifying glass may help) stitched together into one solid mass <br /> Image by Karin Kirk for the Natural Stone Institute <br /> You can tell the difference by looking at the stone. In most cases,you need a magnifier of <br /> some sort. Bring the stone to a well-lit area. Look at the surface of a slab, not the broken <br /> edge. Look as closely as you can, and to try to see the texture and structure of the stone. <br /> Use the photos below as examples. <br /> https://usenaturaistone.org/properties-of-quartzite/ 9/16 <br />