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Found this chunk of crystal in the forest right by a stream today, embedded into a soft rock (clay?)

Was hoping someone could help with this, I was told its quartzite but I'm unsure.

enter image description here

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closed as off-topic by Jan Doggen, Friddy, Fred, Semidiurnal Simon, trond hansen Aug 31 at 4:54

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  • $\begingroup$ Please provide the location where you found the rock. $\endgroup$ – theforestecologist Feb 18 '17 at 19:03
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Almost certainly quartz. But it looks like it's most likely from a quartz vein not quartzite which is metamorphic. I have seen quartzite that looks like that but most often it has a more granular texture. It may be impossible to know for sure unless you can rule out quartzite because of the location. Where was it found?

Please see our guide for asking, 'What is this Rock" questions and edit your question to add more detail.

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  • $\begingroup$ Thank you. It was found near a stream in the British countryside. $\endgroup$ – Nectar May 8 '17 at 18:52
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I think your rock is quartzite. The rocks looks to be part of broken quartzite cobble. It might also be calcite. A simple HCL acid test would tell you if it is calcite.

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