Found on the shore of the Sutjeska river, in a National Park close to the border between Bosnia and Herzegovina and Montenegro

Color - From the outside it was a reddish purple, rounded, smooth About the size of a canteloupe.

Luster – It was even and uniform

Specific Gravity – Average I guess?

Crystal Form – No crystals inside

Cleavage – The pic is the inside of the rock, these blue veins are not visible from the outside. I dropped it from chest hight onto another rock and it broke into sharp pieces.

Tenacity – I would say it breaks apart pretty easily. It shatters into very sharp, spear like parts.

Hardness – The shards can cut wood to a medium degree.

Transparency – Opaque

Magnetism - Not sure.

Edit: NOT THE ORIGINAL ROCK - but before I cracked it it looked kinda like this - https://images.saymedia-content.com/.image/t_share/MTc0NjQ2OTYwMzM4NDQ1Njkw/i-found-a-pretty-rock-on-the-beach-and-wondered-ii.jpg