sparks

  1. 🔎 UNIDENTIFIED Do all types of Quartz emit sparks when hit with steel?

    Will all kinds of Quartz emit sparks when they are hit with steel? What about quartz/quartzite that have rounded surfaces all over like the one shown in the picture? I learned that quartz do gives off sparks when hit by steel. But this one shown in picture do not sparks.
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