I am more curious about the metal on the surface (if it's even metal?) on this stone :)
- I don't really remember where I found it, probably at this beach of the Baltic Sea, but there is also a chance that I found it in another place that has a natural beach.
- It's smooth to the touch, I think the proper term would be greasy lustre, but I'm not a geologist. It has marble like colors - white, grey, black. There is a little of dark green on one side. The linings have definitely metallic lustre. They have aluminum color and on closer inspection it seems as if they are made of tiny metal crystals.
- The hardness is about 6.5 - 7 (steel got scratched, quartz scratched it). I can't identify the linings hardness.
- mass - 17 g, capacity - 5 ml (measurements where done without proper equipment with home tools), density 3,4 g/ml.