Identification please

[PennyG]

Wondering if it's worth the haul up the ravine from the beach of Lake Michigan [emoji4]. Illinois side

 

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[Brian T. Booth]

Beauty is in the eye of the beholder. I think you have Quartz with MnO staining.

 

[SorenCoins]

If you have HCL (hydrochloric acid, sold as muriatic acid) you can put a drop on and see if chlorine gas is produced. Please be careful though do it in a well ventilated area, chlorine is toxic.

MnO + HCL(aq) =MnCl2 - Cl2 - H2O