Obsidian and Apache Tears make awesome tumbled stones. When tumbled properly they are jet black, highly lustrous and beautiful. Many of them are also ...

Obsidian might scratch glass, but then again it might not. That's because "glass" can mean many different materials, anything from clear fused quartz to very ...

Black obsidian is a beautiful natural stone formed by cooled volcanic lava. It's smooth and reflective and doesn't have a crystalline structure. It is ...

In George R.R. Martin's books, as well as in real life, obsidian can be extremely dangerous. ... This means the obsidian breaks into pieces with curved ...