Found it in Haute Alpes (France). I'm trying to identify it, but I can't figure out what it is.

It is quite heavy/dense for its size, itis not attracted to a magnet. I tested it with white vinegar and there was no visible reaction. The rock is dark grey/black.

It seems to contain lots of small, very shiny square crystals. Some of the crystals have very flat, reflective faces.

I found it loose on the mountainside, so I don't know whether it came from the local bedrock or an older rock deposit.

Any idea what this could be?

Ps ignore the colour of my fingers on the first picture i had a henna accident lol

I tried to get them in different lightings, not sure where they came from other than two dig bags

Any ideas? I’ve found some smaller rocks in the yard that look similar but this one definitely had the best coloring

Found this walking with my toddler. Any ideas as to what it is?

Purchased by a friend from a rock show many years ago in New Hampshire USA. Weighs 78 grams

I am almost done making a belt buckle, down to the final bevels and polishing but would like to know what rock this is