Highgrade Mexican Velvet Obsidian Rough Chunk! Opalized Wood and Bat Cave Agate is

and Bat Cave Agate is a form of Moss Agate that can have nice colorations and patterns

They are believed to be closely related to modern day horseshoe crabs

This is a cutting Duo Flatrate

For a long time the coprolite from this formation was thought to be pseudo-coprolite

Highgrade Mexican Velvet Obsidian Rough Chunk! Opalized Wood and Bat Cave Agate isMexican Velvet Obsidian is a higher quality obsidian with loads of magnetite that create the velvet like pattern and flashes within! It often features many different colors, and it works into some truly amazing cabochons! It takes an excellent polish and generally cuts fracture free! They can also make awesome pendants or can be great for wire wrapping projects! The color in velvet obsidian is light sensitive. In order to see it, you need to be under