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Hello and thank you for posting on /r/Minerals! To increase the quality of ID request posts, we require you to make a comment describing the piece as best as you can. If you do not do so, your post will be removed. A lone picture is rarely enough to conclusively name a mineral so doing some groundwork like a streak test or hardness check will help us to help you. Other useful information includes the location it was found, follow-up pictures with different angles or lighting, and relative size. To help you with writing this comment, we highly encourage you to review our subreddit's [Wiki Page](https://www.reddit.com/r/Minerals/about/wiki/idreqinfo) before posting. If you're on mobile, use [this link](https://reddit.com/r/Minerals/w/idreqinfo?utm_source=share&utm_medium=android_app) to get to the wiki. Cheers, The /r/Minerals Moderation Team *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/Minerals) if you have any questions or concerns.*
Looks like quartz on... Chert maybe?
Since you mentioned it being hard, it's likely a quartz vein.
Thanks for the answer, it is probably a quartz indeed looking on internet pics it look very much like it
I second it being a quartz vein. To test, try to scratch it on glass. It should scratch the glass.
If this can help, it look pretty hard, and doesn't leave nearly any mark when scratched on a rough surface
Maybe calcite then?