Hello, first of all, thank you for this useful video and secondly, I had a question about SMITHSONITE, that in the laboratory they pour acid on this mineral and then pour the second solution on the same part and the mineral turns red in that part. Can you please tell me what these solutions are and why they cause this color?❤❤❤
The surface should be scratched a little as oily deposits from fingers and dirty water, etc. can make the surface inert. This happens a lot in student exams where many people have handled that calcite rhomb before you!
