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I was wondering what type of stone this is. I tested it on Mohs hardness scale. It scratched quartz. I found it at Crystal Cave in Kutztown, Pennsylvania. They were selling bags of gems you could sift through, boasting they could have gems in them including emerald, ruby, and garnet. It doesn't break when I try to break it with my fingernail. Its a reflective stone. Lustrous. Smooth. It doesn't have a taste.

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I think it's garnet or ruby, not quite sure.

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  • $\begingroup$ One more test that would be very helpful. Does it leave a streak on unglazed porcelain? See if you can find a plate or a mug with no shiny glaze on the bottom and rub the stone on it to see if some coloured dust comes off. What colour is the streak that is left? You might be able to do it on the foot-ring of a mug if you can't find one that is completely unglazed. The inside of a toilet could work, too :-) $\endgroup$ – haresfur May 4 '15 at 6:19
  • $\begingroup$ Fluorite is another possibility. $\endgroup$ – person27 Jul 20 '15 at 2:05
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When you say that it scratched quartz, do you mean that it left a mark on it? Can you wipe that mark off, or does it stay on the quartz? It may actually be the streak of your stone on quartz. Also, try to scratch your stone with quartz (the reverse of what you did) to confirm your observation.

If your stone is indeed harder than quartz, then my guess that it is a corundum: Also known as 'ruby' when it is red and gemstone quality. If quartz is harder, it is most likely a garnet.

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  • $\begingroup$ Thanks for responding. Based on your comment I think it's garnet, since I was able to scratch it with quartz. $\endgroup$ – Jenny J May 3 '15 at 21:33

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