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

Joe234

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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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signal_line

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it is not the quartz making the sparks, it is the steel. the ferrous material is being removed just like grinding
You can hit quartz against something and see a spark inside. This is the piezo electric effect. But it won’t start a fire.
 

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blauer

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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.
What is the estimated hardness of it?
 

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Kray Gelder

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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.
Striking two quartz pebbles together will also give a spark. No steel needed. Not for fire starting, more of a novelty. We called them spark rocks as kids. It's called triboluminescence.
 

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